Ultrasound-Guided Aspiration of Cystic Lesions in Small Animals

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-11

Key Takeaways

• Ultrasound-guided aspiration of cystic lesions in small animals serves dual diagnostic and therapeutic roles, differentiating simple cysts from neoplasia or abscesses and providing palliation for symptomatic lesions. Key indications include indeterminate cysts on imaging, suspected infection or hemorrhage, and cysts causing mass effect.
• Fluid analysis is critical for diagnosis, with acellular fluid and few macrophages suggesting a simple cyst, while cellular or hemorrhagic fluid warrants further investigation for neoplasia. A recommended fluid analysis panel includes nucleated cell count, total protein, cytology, culture (if infected), and creatinine or bilirubin for site confirmation.
• Contraindications for aspiration include coagulopathy, uncontrolled patient movement, suspected vascular malformations, and inaccessible lesion locations, with hemorrhage being the most common complication. Post-procedure monitoring with repeat ultrasound at 24-72 hours is essential to assess for re-accumulation or hemoperitoneum.
• Needle selection is based on purpose: 22 G for diagnostic aspiration to obtain representative samples without complete cyst collapse, and 18-20 G for therapeutic drainage of larger or more viscous cysts. A minimum sample volume of 1-3 mL is recommended for comprehensive cytology and biochemistry.
• The scientific basis for aspiration relies on the principle that fluid composition reflects tissue of origin, with transudative fluid indicating simple cysts and exudative or hemorrhagic fluid suggesting infection, inflammation, or neoplasia. Ultrasound guidance ensures real-time visualization of the needle tip, minimizing risks to adjacent structures.
• Pre-aspiration ultrasound assessment is paramount, characterizing lesion features like wall thickness, internal echogenicity, and vascularity via color Doppler to plan the safest needle path, avoiding major vessels and organs. This detailed assessment informs the decision framework for aspiration versus monitoring.

Ultrasound-guided aspiration of cystic lesions is a minimally invasive diagnostic and therapeutic procedure routinely performed in small animal practice. This article provides a procedural reference for veterinarians who perform or interpret ultrasound-guided aspiration of renal, ovarian, hepatic, splenic, and other abdominal cystic structures in dogs and cats. It covers patient selection, equipment, technique, sample handling, fluid analysis, and complication management, with emphasis on the diagnostic reasoning that distinguishes simple cysts from cystic neoplasia or abscessation.

The procedure answers two distinct clinical questions. First, it establishes a cytologic or biochemical diagnosis when imaging alone cannot characterize a cystic structure. Second, it provides therapeutic drainage when a cyst causes clinical signs through mass effect, hemorrhage, or infection. The reader is assumed to be comfortable with basic ultrasound physics, machine operation, and aseptic technique. The content aligns with the imaging standards and safety expectations published by professional bodies such as the American College of Veterinary Radiology and the American Veterinary Medical Association.

At a Glance

Pathophysiology of Cystic Lesions

Cystic lesions in small animals arise through several distinct mechanisms, and the underlying pathology determines both the imaging appearance and the expected fluid characteriztics. Simple cysts are lined by a single layer of epithelium and contain transudative fluid produced by the lining cells. They are typically anechoic, round to oval, have a thin imperceptible wall, and show distal acoustic enhancement. Renal cysts in cats, for example, are frequently simple and incidental, although polycystic kidney disease in Persian and related breeds produces multiple bilateral cysts that progressively replace parenchyma.

Ovarian cysts differ in that they may be follicular, luteal, or cystic endometrial remnants. Follicular cysts produce estrogen and can cause clinical signs such as persistent estrus, bone marrow suppression, or alopecia. Luteal cysts produce progesterone and may cause prolonged diestrus or pyometra-like signs. The fluid from these cysts reflects the hormonal activity of the lining cells, and cytology alone cannot reliably distinguish them. Biochemical analysis of fluid hormone concentrations is possible but rarely performed in clinical practice. The MSD Veterinary Manual provides species-specific guidance on ovarian pathology and its clinical consequences.

Hepatic and splenic cysts are less common and may represent congenital ductal malformations, biliary cystadenomas, or cystic degeneration of neoplasms. Biliary cystadenomas in cats are benign but can grow large enough to cause abdominal distension or inappetence. Cystic hepatocellular carcinoma, hemangiosarcoma, and metastatic disease can all present as anechoic or complex cystic masses. The key diagnostic challenge is that imaging features overlap substantially between benign and malignant cystic lesions. A thick wall, internal septations, mural nodules, or mixed echogenicity content increase the index of suspicion for neoplasia, but aspiration remains the definitive minimally invasive test.

Scientific Basis for Aspiration

The rationale for ultrasound-guided aspiration rests on the principle that fluid composition reflects the tissue of origin. Transudative fluid with low cellularity and low protein content supports a simple epithelial-lined cyst. Exudative fluid with high protein, high cellularity, or degenerate neutrophils suggests infection or inflammation. Hemorrhagic fluid may indicate trauma, coagulopathy, or neoplasia with fragile vasculature. Cytologic examination of the sediment can identify neoplastic epithelial cells, macrophages with phagocytosed debris, or infectious organizms.

The technique itself derives from interventional radiology principles established in both human and veterinary medicine. Ultrasound guidance allows real-time visualization of the needle tip, which reduces the risk of inadvertent puncture of adjacent vessels or viscera. The approach is analogous to the transvaginal ultrasound-guided follicular aspiration described in cattle, where repeated puncture of ovarian follicles was shown to be feasible without disrupting cyclicity or causing significant trauma to the animal. That early work by Pieterse and colleagues demonstrated that ultrasound-guided aspiration of fluid-filled structures is a repeatable and safe procedure when performed with appropriate technique. Subsequent studies in bovine reproduction refined the approach, confirming that needle size, aspiration pressure, and timing influence both recovery rates and the quality of harvested material. These principles translate directly to small animal practice, where the same physics of needle tip visualization and fluid dynamics apply.

The evidence base for small animal cystic lesion aspiration is largely extrapolated from case series and clinical experience instead of controlled trials. This is an area of genuine uncertainty. Published guidance from specialty organizations and standard veterinary references supports the procedure as safe and diagnostically useful, but complication rates are not precisely defined. The operator should therefore weigh the diagnostic yield against the small but real risk of hemorrhage, infection, or needle tract seeding when deciding whether to aspirate a particular cyst.

Equipment and Patient Preparation

The essential equipment list is short. A high-frequency linear or microconvex transducer (7.5 to 12 MHz for most small animal applications) provides adequate resolution for superficial cysts. A lower frequency curvilinear transducer may be needed for deep abdominal lesions in large dogs. Needle guides are optional but improve accuracy for small or deeply located cysts. Standard aspiration needles of 22 G for diagnostic samples and 18 to 20 G for therapeutic drainage are appropriate for most cases. Extension tubing, a three-way stopcock, and a syringe of appropriate volume (5 to 20 mL) complete the aspiration set.

Patient preparation includes a 12-hour fast to reduce gastric contents and minimize the risk of aspiration if sedation is required. Most patients tolerate the procedure with mild sedation and local anesthesia, but fractious or painful patients may require deeper sedation or general anesthesia. The procedure should be performed under aseptic conditions. The skin is clipped and surgically prepared, and sterile ultrasound gel or alcohol is used as the coupling medium. Coagulation status should be assessed if the patient has a history of bleeding diathesis, thrombocytopenia, or concurrent anticoagulant therapy. The American College of Veterinary Radiology resources emphasize adherence to radiation safety and imaging standards, and while ultrasound does not involve ionizing radiation, the same professionalism in image acquisition and documentation applies.

General Aspiration Technique

The patient is positioned to optimize access to the cystic structure while minimizing the distance between the skin and the cyst. The transducer is held in one hand and the needle in the other, with the needle advanced along the plane of the ultrasound beam so that the entire needle shaft and tip are visualized. The shortest safe path is chosen, avoiding major vessels, the gallbladder, and loops of bowel. The needle is advanced with a quick, controlled thrust through the body wall and into the cyst cavity. Once the tip is confirmed within the cyst, gentle aspiration is applied. The fluid is collected in the syringe, and the volume is recorded.

For diagnostic aspiration, the goal is to obtain a representative sample without collapsing the cyst completely. For therapeutic drainage, the cyst is emptied as completely as possible, but the operator must be aware that complete collapse may make it difficult to confirm the needle tip position if re-aspiration is needed. The needle is withdrawn with negative pressure maintained to prevent fluid tracking along the needle tract. The sample is immediately transferred to appropriate collection tubes. Ethylenediaminetetraacetic acid (EDTA) is used for cytology and cell counts, a plain tube for biochemistry, and an aerobic culture swab or sterile tube for microbiology if infection is suspected.

Indications and Case Selection

Aspiration is indicated when fluid analysis will change management, when drainage provides palliation, or when a cystic structure must be distinguished from a solid or complex mass. The primary decision is not whether aspiration is possible, but whether the information gained justifies the procedural risk.

Cystic lesions that warrant aspiration include those that are large enough to cause discomfort, those that compress adjacent structures, and those with ultrasound features that raise concern for neoplasia or infection. A simple, anechoic cyst with a thin wall and distal acoustic enhancement in a clinically stable patient may be monitored without intervention. A cyst with internal echoes, a thick or irregular wall, or rapid growth should be aspirated for cytology and fluid analysis.

Patient status changes the risk calculation. Coagulopathic patients, those with thrombocytopenia, and those receiving anticoagulant therapy have a higher bleeding risk. Severe respiratory disease increases the risk of complications during sedation. The presence of a bleeding disorder is a relative contraindication to aspiration of deeply located or highly vascular lesions, and the clinician should weigh the diagnostic yield against the potential for hemorrhage.

Pre-Aspiration Ultrasound Assessment

Complete sonographic evaluation precedes any needle placement. The lesion is characterized in two orthogonal planes. Wall thickness, margin regularity, internal echogenicity, septation, and distal acoustic enhancement are recorded. Color Doppler interrogation identifies vascular structures along the proposed needle path and within the lesion wall. Power Doppler is more sensitive for low-flow vessels and should be used when the lesion is adjacent to major vascular structures.

The needle path is planned to traverse the minimum amount of intervening tissue while avoiding bowel, vessels, and the gallbladder. For renal cysts, a path through the renal parenchyma instead of the hilus reduces the risk of hemorrhage. For ovarian cysts, the approach must avoid the uterine body and major ovarian vessels. Hepatic cysts are approached through a margin of normal hepatic parenchyma when possible.

The patient is positioned to optimize the acoustic window. Dorsal recumbency is often suitable for hepatic and renal lesions, while lateral recumbency may improve access to the ovary. The hair is clipped and the skin prepared aseptically. The transducer is covered with a sterile sleeve and sterile coupling gel is used.

Decision Framework for Aspiration Versus Monitoring

The following table summarizes the ultrasound characteriztics that guide the decision to aspirate or monitor a cystic lesion.

A simple cyst that is small and asymptomatic can be rechecked in three to six months. A complex cyst, a cyst that has grown between examinations, or a cyst associated with clinical signs should be aspirated. When the index of suspicion for neoplasia is high, aspiration cytology is performed even if the fluid appears benign, because neoplastic cells may be present in low numbers.

Aspiration Technique

The procedure is performed under ultrasound guidance using either a freehand technique or a needle guide attached to the transducer. The freehand technique offers greater flexibility in needle angle but requires more skill. A needle guide maintains the needle within the imaging plane and is preferred for small or deeply located lesions.

An 18- to 22-gauge needle is selected based on lesion depth and fluid viscosity. Larger needles, 18 gauge, are used for viscous fluid or when drainage is the primary goal. Smaller needles, 22 gauge, are used for diagnostic aspiration of low-viscosity fluid. A stylet is used during passage through tissue to prevent core contamination.

The needle is advanced under real-time guidance. The needle tip is visualized continuously. Once the tip is within the lesion, the stylet is removed and gentle negative pressure is applied with a syringe. The fluid is aspirated slowly to avoid collapse of the cyst wall and to reduce the risk of hemorrhage from the cyst lining. The syringe is released before the needle is withdrawn to prevent aspiration of tissue into the needle track.

For therapeutic drainage, as much fluid as possible is removed. The cyst may be flushed with sterile saline if the fluid is viscous or if complete drainage is desired. Complete collapse of the cyst is not always achievable, and residual fluid is expected. The volume of fluid removed is recorded.

Fluid Analysis and Sample Handling

Fluid is divided into sterile tubes for culture and plain tubes for cytology and biochemical analysis. A portion is placed in an EDTA tube to prevent clotting and preserve cell morphology. Samples for culture are placed in a sterile container or blood culture medium.

Cytologic evaluation includes total nucleated cell count, protein concentration, and morphologic assessment. Transudates have low cellularity and low protein. Exudates have high cellularity and high protein. Neoplastic effusions may contain atypical cells, but the absence of neoplastic cells does not exclude malignancy. Bile-stained fluid indicates biliary tract communication. Urine-like fluid with a creatinine concentration higher than serum confirms a renal origin.

Microbiologic culture is performed when infection is suspected. Aerobic and anaerobic culture is submitted. Fungal culture is considered when the patient has traveled to endemic regions or when cytology suggests fungal organizms.

Monitoring and Complications

The patient is monitored during and after the procedure. Heart rate, respiratory rate, and mucous membrane color are assessed at five-minute intervals during recovery. The puncture site is observed for swelling or hemorrhage. An ultrasound examination is repeated immediately after aspiration to assess for active bleeding or inadvertent puncture of adjacent structures.

Hemorrhage is the most common complication. Mild hemorrhage into the cyst or along the needle track is usually self-limiting. Significant hemorrhage is suggested by a declining packed cell volume, tachycardia, or a distended abdomen. Hypotension and pallor indicate the need for fluid resuscitation and surgical assessment.

Pneumothorax is a risk when the lesion is in the cranial abdomen or when the needle path crosses the diaphragm. Tachypnea, dyspnea, or decreased lung sounds after the procedure warrants thoracic imaging. Peritonitis may follow aspiration of an infected cyst or inadvertent puncture of the gastrointestinal tract. Fever, abdominal pain, or lethargy in the 24 hours after the procedure should prompt reevaluation.

Sedation requirements vary with patient temperament and lesion location. Most patients require moderate sedation with an opioid and a benzodiazepine or a low-dose alpha-2 agonist. General anesthesia is reserved for uncooperative patients or for lesions that require precise needle placement. The choice of sedation is guided by the patient's cardiovascular and respiratory status, and current formulary references should be consulted for dosing.

Documentation

The ultrasound report records the lesion location, dimensions, wall characteriztics, internal contents, and Doppler findings. The needle gauge, approach, volume of fluid removed, and fluid appearance are documented. The fluid analysis results, including cytology, protein, and culture, are recorded with the date of submission. Serial measurements of the lesion are compared with previous studies to document response to drainage or progression of disease.

Imaging findings should be interpreted in the context of the patient's signalment, history, and clinical signs. The American College of Veterinary Radiology resources provide standards for image acquisition and reporting that support consistent documentation. The MSD Veterinary Manual offers species-specific guidance on the interpretation of cystic lesions and the clinical significance of fluid analysis findings.

Complications and Failure Modes

Aspiration of cystic lesions carries a defined set of complications, most of which are detectable during or immediately after the procedure. Hemorrhage is the most common significant complication. Needle passage through vascular structures, particularly within the renal cortex or hepatic parenchyma, can produce subcapsular hematoma or hemoperitoneum. Early detection relies on real-time observation of echogenic fluid swirling at the needle tip, progressive loss of the cyst margin, or the appearance of free fluid in the peritoneal cavity. Color Doppler interrogation of the intended needle path before puncture reduces this risk. If hemorrhage occurs, maintain needle position until flow ceases, apply transducer pressure over the site for several minutes, and reassess with Doppler.

Infection is a second major failure mode. Contamination can arise from inadequate skin preparation, passage of the needle through infected tissue, or introduction of skin flora along the needle tract. Clinical signs of peritonitis or sepsis may be delayed by 24 to 72 hours. Fever, lethargy, abdominal pain, or progressive leukocytosis after the procedure should prompt immediate re-evaluation. Strict aseptic technique, including clipping and surgical scrub of the puncture site, is non-negotiable. The American College of Veterinary Radiology resources emphasize adherence to standard imaging-guided intervention protocols, including sterile probe covers and gel.

Cyst recurrence is an expected outcome for many lesions, particularly ovarian cysts and renal cysts, because aspiration does not ablate the epithelial lining. Owners should be counselled before the procedure that recurrence is likely and that repeat aspiration may be required. Rapid re-accumulation within days suggests either incomplete drainage or a secretory lesion that may benefit from sclerotherapy, which carries its own risk profile.

Needle tract seeding of neoplastic cells is a recognized but uncommon complication. It is most relevant when aspirating cystic lesions that harbour solid mural components, such as cystic renal cell carcinoma or biliary cystadenocarcinoma. If the pre-aspiration ultrasound identifies mural irregularity, solid nodules, or thick septations, reconsider whether aspiration is diagnostically sufficient or whether surgical excision is more appropriate.

Common Errors and Corrective Actions

Less experienced operators frequently misidentify the target. An anechoic structure that appears cystic may be a dilated renal pelvis, a distended gallbladder, or a vascular structure in cross-section. Color Doppler is the discriminating tool. A true cyst is avascular, whereas vessels show flow. Similarly, the renal pelvis can be distinguished from a renal cyst by tracing its continuity with the ureter and by the absence of a distinct cortical margin.

Needle tip visualization is the most common technical error. The needle may deflect off the cyst wall, particularly with small or tense cysts, or the tip may pass through the far wall, puncturing adjacent structures. The corrective action is to align the needle parallel to the transducer face, use a needle guide where available, and gently rotate or jiggle the needle to confirm tip position before aspiration. If the tip is not clearly seen, do not advance.

Aspirating too aggressively can collapse the cyst wall into the needle bevel, terminating drainage prematurely. Use gentle, intermittent suction and stop when flow ceases. If the cyst collapses completely, withdraw the needle slowly while maintaining slight negative pressure to capture any residual fluid.

Inadequate sample volume is a frequent problem. For small cysts, the needle may fill with blood or the fluid may be too viscous to aspirate through a small-gauge needle. Using a larger gauge needle, such as 18 or 20 gauge, and rotating the needle during aspiration improves yield. If the fluid is mucinous or purulent, consider flushing with a small volume of sterile saline and re-aspirating.

Limitations of Current Evidence

The evidence base for ultrasound-guided aspiration of cystic lesions in small animals is largely extrapolated from case series, expert opinion, and techniques developed in other species. Controlled comparative studies evaluating aspiration against surgical management or monitoring are scarce. The MSD Veterinary Manual provides general guidance on cystic lesion management, but specific complication rates and long-term outcomes for aspiration in dogs and cats are not well quantified.

Expert opinion differs on several points. Whether ovarian cysts should be aspirated for diagnosis or removed surgically remains contested, particularly in intact females where the cyst may be functional and transient. Some clinicians advocate aspiration of all renal cysts to rule out neoplasia, while others reserve aspiration for cysts causing clinical signs, given the low yield of neoplastic cells in simple cysts. The role of sclerotherapy in small animals is similarly debated, with limited published safety data.

Referral and Escalation

Referral to a specialist is warranted when the lesion is not safely accessible, when the operator cannot confidently identify the target, or when the patient is unstable. Deep pelvic cysts, cysts adjacent to major vessels, and cysts in patients with coagulopathy should be referred to a board-certified radiologist or surgeon. The American Veterinary Medical Association practice resources provide guidance on referral criteria and interventional radiology availability.

Laboratory involvement is required when fluid analysis reveals atypical cells, when culture is requested, or when biochemical analysis of the fluid is needed to distinguish transudate from exudate. If cytology suggests neoplasia, histopathology of the cyst wall is necessary for definitive diagnosis, and surgical referral should be discussed.

Regulatory reporting is rarely required for aspiration of cystic lesions. However, if the lesion is suspected to be an abscess caused by a notifiable organizm, or if the patient is a production animal where residue concerns apply, consult the WOAH terrestrial animal health standards for applicable reporting obligations. In companion animal practice, reporting is generally limited to suspected animal cruelty or public health concerns, such as a cystic lesion infected with zoonotic organizms.

Frequently Asked Questions

What Is the Minimum Ultrasound Equipment Needed to Perform Cyst Aspiration Safely?

A machine with a microconvex or linear transducer operating at 5 to 10 MHz is adequate for most small animal cystic lesions. The transducer must allow real-time visualization of the needle tip, so a biopsy guide or freehand technique with a needle guide attachment is recommended. Color Doppler capability is strongly advised to identify vascular structures along the needle path, particularly for renal and hepatic lesions. If Doppler is unavailable, pre-scan the lesion thoroughly in B-mode and choose a path that avoids visible vessels. The American College of Veterinary Radiology resources provide guidance on imaging standards and equipment expectations for interventional procedures.

How Should I Proceed When a Cystic Lesion Cannot Be Aspirated With the Equipment Available?

If the lesion is too deep, too small, or located near major vasculature, do not attempt aspiration with suboptimal equipment. Options include referral to a specialist center with interventional ultrasound capabilities, or computed tomography-guided aspiration if available. For renal cysts in cats, a conservative approach with serial ultrasound monitoring every 3 to 6 months is acceptable when the lesion is small, asymptomatic, and has benign features. The MSD Veterinary Manual notes that many cystic lesions are incidental findings that do not require intervention. Document the reason for deferral clearly in the medical record and schedule a recheck examination.

What Fluid Analysis Tests Should Be Requested After Aspiration?

Submit fluid in a plain sterile tube for cytology and culture, and if available, a second tube with EDTA for cell counts and protein concentration. Cytology should assess cellularity, cell types, and presence of neoplastic cells. Biochemistry on the fluid, including creatinine, bilirubin, or bile acids, helps differentiate cystic lesions from urinary or biliary origin. Culture and susceptibility testing are indicated when infection is suspected, particularly for renal or prostatic cysts. If the fluid is hemorrhagic, distinguish iatrogenic blood contamination from true hemorrhage by comparing the fluid hematocrit with peripheral blood. The MSD Veterinary Manual provides reference guidance on interpreting body fluid analysis in small animals.

Can Ovarian Cyst Aspiration Be Performed in Cats, and Does It Differ From Dogs?

Ovarian cyst aspiration is technically feasible in cats but is performed less commonly than in dogs. Feline ovaries are small and mobile, making transabdominal targeting more challenging. The procedure is usually reserved for diagnostic confirmation of cystic ovarian disease before ovariohysterectomy, or for temporary relief in breeding queens where preservation of ovarian tissue is desired. In dogs, ovarian cysts are often functional and may regress spontaneously, so aspiration is indicated when cysts persist or when hormonal testing is inconclusive. Ultrasound-guided transvaginal aspiration, as described in bovine reproductive research, is not practical in small animals due to anatomic differences. Refer to reproductive technology reviews for comparative context on ovarian aspiration approaches across species.

What Should I Document in the Medical Record After the Procedure?

Record the indication for aspiration, pre-procedure ultrasound findings including lesion size, location, wall thickness, and internal echogenicity, and the needle gauge and approach used. Document the volume of fluid aspirated, its gross appearance, and the number of passes required. Note whether the lesion collapsed completely or partially, and record any complications such as hemorrhage or inadvertent puncture of adjacent structures. Include the fluid analysis results and the plan for follow-up imaging. The American Veterinary Medical Association practice resources emphasize that complete and contemporaneous medical records support continuity of care and medicolegal defensibility. If the client declined recommended culture or cytology, document that decision explicitly.

How Do I Explain the Risks and Benefits of Cyst Aspiration to a Client?

Explain that the procedure is minimally invasive, usually performed with sedation and local anesthesia, and provides diagnostic information that can guide treatment decisions. Describe the main risks as hemorrhage, infection, needle tract seeding of neoplastic cells, and failure to obtain a diagnostic sample. Be honest that some cystic lesions are benign and require no treatment, while others may be neoplastic and aspiration alone is not curative. For ovarian cysts, note that aspiration may be temporary and recurrence is possible. The WOAH terrestrial animal health standards underscore the importance of clear communication about procedural risks in veterinary practice. Offer the client a written estimate and obtain informed consent before proceeding.

Related Clinical & Scientific Guides

• MRI Monitoring of Brain Tumor Response to Therapy in Dogs
• Ultrasound-Guided Drainage of Abscesses in Small Animals
• Radiographic Monitoring of Total Hip Replacement in Dogs

References and Further Reading

• A 100-Year Review: Reproductive technologies in dairy science.. 2017.
• Influence of premature induction of a luteinizing hormone surge with gonadotropin-releasing hormone on ovulation, luteal function, and fertility in cattle.. 2007.
• Prolonged dominance of follicles and reduced viability of bovine oocytes.. 1996.
• Aspiration of bovine oocytes during transvaginal ultrasound scanning of the ovaries.. 1988.
• Manipulation of follicular development to produce developmentally competent bovine oocytes.. 2002.
• Endoscopic ultrasound-guided gastroenterostomy using novel tools designed for transluminal therapy: a porcine study.. 2012.
• American College of Veterinary Radiology Resources. American College of Veterinary Radiology.
• MSD Veterinary Manual, Professional Edition. MSD Veterinary Manual.
• American Veterinary Medical Association Practice Resources. American Veterinary Medical Association.

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• Ultrasound-Guided Drainage of Abscesses in Small Animals
• Ultrasound-Guided Interventional Procedures for Treatment in Small Animals
• Ultrasound-Guided Cystocentesis for Therapeutic Drainage in Dogs and Cats

This article is educational professional reference material for veterinary audiences. It is not a substitute for veterinary diagnosis, individual clinical judgment, current product labeling, or applicable regulatory requirements.