# Liver Ultrasound: Interpretation Guide By the end of this guide you will be able to set up a liver ultrasound examination, choose the right transducer, obtain the standard hepatic views, and describe what you see using the vocabulary radiologists actually use. You will know how to judge liver size, echotexture, and vascular landmarks, and you will know which findings are diffuse, which are focal, and which require a sample before anyone can name a disease. You need a machine with a curved or phased array probe, a linear probe for shallow structures, coupling gel, clippers, and a quiet, dimly lit room. Most abdominal scans in dogs and cats use a 5 to 8 MHz curved array probe. A 7 to 10 MHz linear probe improves resolution for the gallbladder wall, biliary tree, and superficial liver lobes in cats and small dogs. Have alcohol or chlorhexidine for the skin, and a table that lets you reach the right side of the patient without leaning across the abdomen. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Why the Liver Is a Hard Organ to Interpret The liver sits behind the rib cage on the right side, tucked under the diaphragm. Gas in the stomach and duodenum, ribs, and the patient's breathing all interfere with the image. The liver also has a dual blood supply, from the portal vein and the hepatic artery, which is why vascular landmarks matter so much. The most common mistake in liver ultrasound is overreading. A hyperechoic liver does not equal lipidosis. A hypoechoic nodule does not equal cancer. Ultrasonography of the liver is a screening and localization tool. It tells you where to put a needle. It does not replace cytology or histology. A study of dogs and cats with confirmed lymphoma found that liver ultrasonography had a sensitivity of only 16.7% for detecting lymphomatous infiltration, even though specificity was high at 91.0% [1]. In other words, a normal-looking liver does not rule out infiltration, and a normal liver in a dog was associated with not having lymphomatous infiltration [1]. That single number should shape how you phrase every report. ## Patient Preparation ### Fasting Food in the stomach pushes the liver caudally and fills the stomach with gas, which scatters the sound beam. A 12-hour fast is standard for a complete abdominal ultrasound in dogs. Cats tolerate a 6 to 8 hour fast well and do not need the same duration. Fasting also distends the gallbladder, which makes the biliary tree easier to see. Do not fast a diabetic patient or a very young puppy for 12 hours without veterinary direction. ### Hair and skin Clip a wide window from the xiphoid to the mid-abdomen on the right side, and extend up the right thoracic wall over the 10th to 13th intercostal spaces. Alcohol alone works for short scans. Chlorhexidine scrub is better for longer examinations. Do not use alcohol near a cautery or open wound. ### Positioning Right lateral recumbency is the default for liver scanning because gravity pulls the liver toward the dependent right side and away from the gas-filled stomach. Dorsal recumbency works well for the left liver lobes and the gallbladder in cats. Standing or sternal positioning is useful for a patient that cannot be restrained on its side, and it lets you assess the caudal vena cava for volume status [2]. ## Transducer Selection | Structure | Probe | Frequency | Why | |--|--|--|--| | Whole liver, deep lobes | Curved array | 5 to 8 MHz | Penetration to 10 to 15 cm | | Gallbladder wall, biliary tree | Linear array | 7 to 10 MHz | High resolution in the near field | | Small dogs and cats, superficial lobes | Linear or curved | 8 to 12 MHz | Detail without losing depth | | Vascular landmarks, CVC | Curved or phased array | 5 to 8 MHz | Doppler and flow assessment | Use tissue harmonic imaging when available. It improves contrast and reduces artifact from body wall layers. A study comparing standard and harmonic images of the kidney and liver found that renal cortical intensity was significantly higher than liver intensity using deep half-annular regions of interest, but not with small superficial squares [3]. That is a reminder that where you place your measurement region changes what you measure. ## Standard Views ### Subcostal view Place the probe just caudal to the xiphoid, angled cranially and to the right. This is the fastest way to see the gallbladder, the left liver lobes, and the portal vein. Fan through the liver from left to right. Ask the patient to take a breath if you can, because the liver moves caudally on inspiration and you can see more of the diaphragmatic surface. ### Intercostal view Place the probe in the 10th to 13th intercostal spaces on the right side, parallel to the ribs. This view reaches the right liver lobes and the caudal vena cava. Angle the probe cranially to see the hepatic veins entering the vena cava. Use the intercostal view when the subcostal view is blocked by gas. ### Right lateral view With the patient in right lateral recumbency, the liver falls toward the table. This view gives the best overview of liver size and the relationship between the liver, kidney, and spleen. It is also the view used in the abdominal focused assessment with sonography for trauma, or AFAST, which includes a diaphragmatico-hepatic window [4]. AFAST is a rapid screening test for free fluid and soft tissue abnormalities, and it lets you characterize the caudal vena cava and hepatic veins for volume status [4]. ## A Systematic Walkthrough Work in the same order every time. Consistency is what makes serial scans useful. 1. Identify the liver margins and estimate size against the kidney and spleen. 2. Assess overall echotexture and compare it to the spleen and renal cortex. 3. Check for focal lesions and describe their number, size, and margin. 4. Trace the portal vein, hepatic veins, and caudal vena cava. 5. Examine the gallbladder and biliary tree. 6. Look for free fluid, lymph nodes, and peritoneal fat changes. 7. Decide whether the findings are diffuse or focal, and whether a sample is needed. ```mermaid flowchart TD A[Start scan] --> B[Clip and fast patient] B --> C[Choose probe for depth] C --> D[Subcostal view] D --> E[Intercostal view] E --> F[Right lateral view] F --> G{Size normal} G -->|Yes| H[Assess echotexture] G -->|No| I[Compare to kidney and spleen] H --> J{Focal lesion seen} I --> J J -->|Yes| K[Describe and sample] J -->|No| L[Assess vessels and gallbladder] K --> M[Report and plan] L --> M ``` ## Normal Hepatic Echotexture The normal liver is fine-grained and uniform. The classic teaching is that the liver is isoechoic to the spleen and hypoechoic to the renal cortex. That teaching is close but not perfect. A prospective study of 25 healthy adult dogs found that the right renal cortex was more commonly hyperechoic to the liver, and that renal cortical pixel intensity was significantly higher than liver intensity when measured with deep half-annular regions of interest [3]. So a liver that looks slightly darker than the adjacent kidney cortex can be normal. Do not call it abnormal on that basis alone. Compare the liver to the spleen in the same image. In most dogs and cats the liver and spleen are similar in echogenicity, with the spleen often slightly more echogenic. In cats the spleen is normally quite uniform. In dogs the spleen is often coarser and more echogenic than the liver. Species differences matter here. ### Liver size Liver size is subjective. A small liver with rounded or pointed lobe margins suggests microhepatia, which is common with portosystemic shunting and chronic fibrosis. A large liver with rounded, blunted lobe margins suggests hepatomegaly, which is common with vacuolar hepatopathy, lipidosis, and infiltrative disease. The combination of a small liver, large kidneys, and uroliths had a positive predictive value of 100% for congenital [portosystemic shunt in dogs](/knowledge/veterinary-medicine/clinical-methods/canine-portosystemic-shunt-diagnosis-surgical-management), but a negative predictive value of only 51% [5]. So the combination is useful when present, but its absence does not exclude a shunt. ### Portal vein clarity In a normal liver the portal vein walls are visible as bright parallel lines, and the lumen is anechoic. Loss of portal vein wall clarity is a soft sign of diffuse disease. A study of diffuse [liver disease in dogs](/knowledge/veterinary-medicine/internal-medicine/canine-liver-disease) and cats found that portal venous clarity was one of the criteria radiologists applied when categorizing disease [6]. Treat loss of clarity as a prompt to look harder, not as a diagnosis. ## Diffuse Changes Diffuse disease affects the whole liver. The ultrasound findings are changes in echotexture, attenuation, and size, not discrete masses. ### Hyperechoic liver A liver that is brighter than the spleen and kidney cortex suggests increased fat or vacuolar change. Steroid hepatopathy is a useful model. A study of dogs with experimentally induced steroid hepatopathy found that prednisolone administration increased acoustic backscatter, meaning the liver became hyperechoic relative to the kidney, and produced significant depth attenuation [7]. Depth attenuation was the earliest detectable acoustic change in that study, and liver-kidney contrast correlated well with histology [7]. That is a practical point. If the liver looks bright near the transducer and darkens quickly with depth, think about diffuse infiltrative or vacuolar disease. Lipidosis and vacuolar hepatopathy are the two most common diffuse hyperechoic patterns. They can look identical on ultrasound. The distinction is made on cytology or histology, not on the image. ### Hypoechoic liver A liver that is darker than normal, or darker than the spleen, suggests inflammation, edema, or round-cell infiltration. Acute hepatitis, cholangitis, and lymphoma can all produce a hypoechoic liver. Again, the image does not tell you which one. ### Mixed or coarse echotexture A coarse, mottled liver with mixed echogenicity suggests chronic disease, fibrosis, or cirrhosis. Nodular regeneration can create a patchy appearance that mimics neoplasia. This is one of the hardest patterns to interpret, and it is a strong indication for sampling. ### Diffuse disease categories A retrospective study of 229 dogs and 104 cats applied sonographic criteria to seven categories of diffuse liver disease: normal, inflammation, round-cell neoplasia, non-round-cell infiltrative prenodular metastatic neoplasia, lipidosis, vacuolar hepatopathy, and other [6]. The study evaluated criteria including parenchymal sound attenuation with depth, comparative organ echogenicity, diffuse or patchy hyperechoic or hypoechoic echotexture, uniform or coarse echotexture, portal venous clarity, and liver lobe geometry, plus extrahepatic criteria such as gallbladder wall thickness, bile duct diameter, gallbladder precipitate, hepatic vein diameter versus caudal vena cava diameter, peritoneal fluid, and spleen and kidney echotexture [6]. The takeaway for practice is that no single criterion separates these categories. You need a combination, and you need a sample. ## Focal Lesions Focal lesions are discrete. Describe them by number, size, location, margin, and internal echogenicity. ### Nodular hyperplasia Nodular hyperplasia is common in older dogs. The nodules are usually small, well-defined, and isoechoic or mildly hypoechoic to the surrounding liver. They can be single or multiple. They do not usually cause mass effect. Nodular hyperplasia is a benign lesion and is one of the benign causes of a target lesion [8]. ### Neoplasia Primary liver tumors and metastatic lesions can look like almost anything. They may be hypoechoic, hyperechoic, mixed, or target lesions. A target lesion is a nodule or mass with a hypoechoic rim and a hyperechoic or isoechoic center. In a series of 21 dogs and one cat, 12 of 16 hepatic target lesions and 5 of 7 splenic target lesions were malignant [8]. The finding of one or more target lesions in the liver or spleen had a positive predictive value for malignancy of 74%, and multiple target lesions in one organ raised that to 81% [8]. Benign lesions associated with target lesions included nodular hyperplasia, pyogranulomatous hepatitis, cirrhosis, and chronic active hepatitis [8]. So a target lesion is a strong prompt to sample, not a diagnosis. ### Cysts Hepatic cysts are anechoic, thin-walled, and show distal acoustic enhancement. They do not have internal flow on Doppler. Simple cysts are usually incidental. Do not confuse a cyst with an abscess or a necrotic tumor, which may have a thick wall, internal debris, and a mixed echotexture. ### Abscesses Hepatic abscesses are rare and difficult to diagnose in dogs and cats [9]. They may appear as focal lesions with mixed echogenicity, thick irregular walls, and internal debris. In cats, four of 14 had solitary abscesses, all in the right liver lobes, and the other 10 had multifocal small abscesses or microabscesses [10]. Clinical signs were vague and included anorexia, lethargy, and weight loss, and only 23% of cats had fever while 31% were hypothermic [10]. Ultrasound is essential for localizing hepatic abscesses, and percutaneous ultrasound-assisted drainage and alcoholization with 95% ethanol has been described in dogs and cats [9]. That procedure is a specialist intervention, not a first-line office technique. ### Gas within the liver Gas in the liver produces bright echoes with dirty acoustic shadowing. The pattern matters. A retrospective study of 37 dogs and cats with hepatic emphysema classified cases as portal venous gas in 23, parenchymal emphysema in 10, and biliary emphysema in four [11]. Clinical categories included infection or sepsis, gastrointestinal disease, iatrogenic causes, trauma, and liver neoplasia [11]. Portal venous gas was mostly transient on follow-up, and mortality differed sharply: 21.7% for portal venous gas versus 90% for parenchymal emphysema [11]. Distinguishing portal venous gas from parenchymal gas is therefore not academic. Portal venous gas moves with the bloodstream and often resolves. Parenchymal gas carries a much worse prognosis. ## Vascular Landmarks ### Portal vein The portal vein enters the liver at the porta hepatis and branches within the parenchyma. Its walls are echogenic because of surrounding connective tissue. Measure the portal vein and compare it to the aorta and caudal vena cava. In a study of 85 dogs and 17 cats with suspected portosystemic shunting, the portal vein to aorta ratio and portal vein to caudal vena cava ratio were smaller in animals with extrahepatic shunts than in animals with microvascular dysplasia, intrahepatic shunts, or no portal venous anomaly [5]. All dogs and cats with a portal vein to aorta ratio of 0.65 or less had an extrahepatic shunt or idiopathic noncirrhotic portal hypertension, and animals with ratios of 0.8 or greater for portal vein to aorta and 0.75 or greater for portal vein to caudal vena cava did not have an extrahepatic shunt [5]. Ultrasonography was 92% sensitive and 98% specific for identifying portosystemic shunting in that population, with overall accuracy of 95% [5]. ### Hepatic veins The hepatic veins drain into the caudal vena cava. They have thin walls and no echogenic border, which distinguishes them from portal veins. In a normal animal the hepatic veins are anechoic and phasic with respiration and the cardiac cycle. Distension of the hepatic veins and caudal vena cava suggests right-sided congestion or volume overload. A case series of 13 dogs and one cat with gallbladder wall edema associated with cardiac disease found caudal vena cava and hepatic venous distension in five of six animals in which these structures were characterized [12]. Cardiac diagnoses included pericardial effusion in 11 dogs, dilated cardiomyopathy in one, and right-sided myocardial failure in one [12]. ### Caudal vena cava The caudal vena cava runs along the dorsal right side of the abdomen and passes through the liver. It is a key landmark for volume status. AFAST and TFAST use the diaphragmatico-hepatic view to characterize the caudal vena cava and hepatic veins [4][2]. A distended, non-collapsing vena cava suggests congestion. A flat, collapsing vena cava suggests hypovolemia. These are point-of-care assessments, not definitive measurements. ### Vascular wall changes Vascular wall thickness and echogenicity can change with systemic disease. A study of dogs and cats with leishmaniosis found that in dogs, wall thickening most frequently affected intrahepatic portal branches, hepatic veins, the caudal vena cava, and the splenic vein, with thickened walls predominantly hyperechoic and often associated with intraluminal smoke and mural thrombi [13]. That study also established reference ranges for abdominal vascular wall thickness in healthy dogs and cats [13]. In practice, look at the vessel walls, not just the lumen. A hyperechoic, thickened wall with intraluminal smoke is a red flag for vasculitis or thrombosis. ## Gallbladder and Biliary Tree The gallbladder is a pear-shaped, anechoic structure on the right side of the liver between the quadrate and right medial lobes. The wall is normally thin, less than 2 to 3 mm in dogs, and thinner in cats. Measure the wall at its thickest point. Gallbladder wall edema is a wall thickness of 3 to 5 mm with a hypoechoic rim [12]. It is a marker for anaphylaxis in dogs, but cardiac disease can cause the same appearance [12]. In the cardiac case series, gallbladder findings included mural thickness of 3 to 5 mm, mild to moderate sludge in three animals, and mild to moderate luminal distension in six [12]. Ascites was present in nine of 13 animals [12]. If you see gallbladder wall edema, look at the heart and the caudal vena cava before you assume anaphylaxis. Gallbladder torsion is rare. A case report in a cat described a small gallbladder, indistinct fundus, a continuous spiral-shaped morphology forming C- and reverse C-shaped curves, and hyperechoic fat surrounding the gallbladder [14]. That appearance is unusual and should prompt surgical consultation. ## Table of Findings and Likely Differentials | Finding | Common differentials | Next step | |--|--|--| | Diffuse hyperechoic liver with depth attenuation | Lipidosis, vacuolar hepatopathy, steroid hepatopathy | Cytology or histology | | Diffuse hypoechoic liver | Acute inflammation, cholangitis, round-cell neoplasia | Cytology or histology | | Coarse mottled liver | Chronic hepatitis, fibrosis, cirrhosis, nodular regeneration | Histology | | Small liver with rounded margins | Portosystemic shunt, chronic fibrosis | Bile acids, ammonia, vascular imaging | | Large liver with blunted margins | Vacuolar hepatopathy, lipidosis, infiltration | Cytology or histology | | Single target lesion | Nodular hyperplasia, neoplasia, abscess | Cytology or histology | | Multiple target lesions | Neoplasia, especially metastatic or round-cell | Cytology or histology | | Anechoic thin-walled lesion with distal enhancement | Cyst | Monitor or sample if atypical | | Mixed echogenicity lesion with thick wall and debris | Abscess, necrotic tumor | Cytology, culture, imaging follow-up | | Bright echoes with dirty shadowing in portal vein | Portal venous gas | Assess for sepsis, gastrointestinal disease | | Bright echoes with dirty shadowing in parenchyma | Parenchymal emphysema | Urgent assessment, poor prognosis | | Gallbladder wall 3 to 5 mm with hypoechoic rim | Anaphylaxis, cardiac disease, right-sided congestion | Assess heart and caudal vena cava | | Distended caudal vena cava and hepatic veins | Right-sided cardiac disease, volume overload | Echocardiography | ## Sampling the Liver Ultrasound-guided biopsy is the standard way to reach a diagnosis when the image shows diffuse or focal change. The most common complication is hemorrhage after sampling, which can be fatal [15]. A retrospective study of 105 dogs and cats found post-interventional complications in 26 of 105 patients, or 24.8%, with 21.9% minor and 2.9% major [15]. Free abdominal fluid was detected sonographically after intervention in 22 of 94 dogs, or 23.4%, and four of 11 cats, or 36.4% [15]. Three of 10 dogs with a clinically significant prolonged coagulation time of more than 25% had ascites after biopsy [15]. Check coagulation parameters before you sample, and have a plan for hemorrhage. Fine-needle aspiration is less invasive and can be done in the office. It gives you cytology, which is useful for round-cell neoplasia, inflammation, and lipidosis. It does not give you tissue architecture, so it cannot reliably distinguish nodular hyperplasia from well-differentiated neoplasia. Histology from a core biopsy or surgical wedge is needed for that. ## Clinical Relevance, Limitations and Common Mistakes Ultrasonography of the liver is a localization tool. It tells you whether the disease is diffuse or focal, whether the biliary tree is involved, and whether the vasculature is abnormal. It does not tell you the diagnosis. The sensitivity of liver ultrasound for lymphomatous infiltration was 16.7% in one study, which means most infiltrated livers looked normal [1]. Specificity was high, so an abnormal liver is meaningful, but a normal liver is not reassuring [1]. The most common mistakes are overreading echogenicity, calling a nodule benign or malignant without a sample, and forgetting to compare the liver to the spleen and kidney in the same image. Another common mistake is measuring the gallbladder wall in a patient that just ate, because the wall thickens transiently after a meal. Fast the patient. Individual cases need a veterinarian who can integrate the history, physical examination, laboratory data, and imaging. No single ultrasound finding stands alone. ## Frequently Asked Questions ### What does a normal liver look like on ultrasound? A normal liver is fine-grained and uniform, roughly isoechoic to the spleen and slightly hypoechoic to the renal cortex, though the renal cortex can be slightly hyperechoic to the liver in healthy dogs [3]. The portal vein walls are visible and the lumen is anechoic. ### Can ultrasound tell the difference between lipidosis and vacuolar hepatopathy? No. Both produce a diffuse hyperechoic liver, and the two can look identical. The distinction requires cytology or histology. ### Does a normal liver ultrasound rule out cancer? No. Liver ultrasound had a sensitivity of only 16.7% for lymphomatous infiltration in one study, so a normal-appearing liver does not exclude infiltration [1]. ### What is a target lesion in the liver? A target lesion is a nodule or mass with a hypoechoic rim and a hyperechoic or isoechoic center. In one series, 12 of 16 hepatic target lesions were malignant, and the positive predictive value for malignancy was 74% for one or more target lesions [8]. ### What does gas in the liver mean? Gas in the liver can be portal venous, parenchymal, or biliary. Portal venous gas is often transient and had a mortality of 21.7% in one study, while parenchymal emphysema had a mortality of 90% [11]. The pattern matters for prognosis. ### Why does the gallbladder wall look thick? Gallbladder wall edema can be caused by anaphylaxis or by cardiac disease with right-sided congestion [12]. Wall thickness of 3 to 5 mm with a hypoechoic rim is the typical appearance [12]. ### How do I know if the liver is small? Compare the liver to the kidney and spleen and look at the lobe margins. A small liver with rounded or pointed margins suggests microhepatia. The combination of a small liver, large kidneys, and uroliths had a positive predictive value of 100% for congenital portosystemic shunt in dogs, but the negative predictive value was only 51% [5]. ### Is a liver biopsy safe? Ultrasound-guided liver biopsy is generally safe but not risk-free. In one study, post-interventional complications occurred in 24.8% of patients, with 2.9% classified as major [15]. Coagulation status should be checked before sampling. ## Related Articles - [Ultrasonography in Exotic Pets: Applications and Limitations](/knowledge/veterinary-medicine/diagnostic-imaging/ultrasonography-exotic-pets-applications-limitations) - [Common Artifacts in Veterinary Ultrasonography](/knowledge/veterinary-medicine/diagnostics/common-artifacts-in-veterinary-ultrasonography-a-troubleshooting-guide-to-avoid-misdiagnosis) - [Ultrasonography in Avian Patients](/knowledge/veterinary-medicine/exotic-animal-medicine/ultrasonography-in-avian-patients-indications-techniques-and-normal-findings-in-psittacines-and-rapt) - [Ultrasonography of the Equine Abdomen: Indications and Findings](/knowledge/veterinary-medicine/diagnostic-imaging/ultrasonography-equine-abdomen-indications-findings) - [Bovine Reproductive Ultrasonography: Applications and Interpretation](/knowledge/veterinary-medicine/theriogenology/bovine-reproductive-ultrasonography-applications-and-interpretation) - [Ultrasound of the Canine and Feline Liver and Biliary System: Normal and Abnormal Findings](/knowledge/veterinary-medicine/diagnostic-imaging/ultrasound-canine-feline-liver-biliary-system-normal-abnormal-findings) ## Sources 1. 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