Liver Disease & Hepatic Masses in Dogs & Cats
The liver is the most metabolically active organ in the body and a common site for both primary and secondary disease in dogs and cats. From diffuse hepatopathies like chronic hepatitis, vacuolar hepatopathy, and lipidosis, to focal masses including hepatocellular carcinoma and metastatic tumors, liver disease spans an enormous spectrum — and the ultrasound appearance guides every diagnostic and treatment decision.
At Sage Veterinary Imaging, abdominal ultrasound is the cornerstone of hepatic evaluation. It assesses liver size, parenchymal echogenicity patterns, biliary anatomy, hepatic vasculature, and focal lesions, and enables ultrasound-guided fine-needle aspiration (FNA) for cytologic diagnosis without surgery.
SVI offers expert hepatic ultrasound at our centers in Round Rock, Texas; Spring, Texas; and Sandy, Utah.
Liver Disease at a Glance
Diffuse vs. Focal Liver Disease
Liver disease in dogs and cats falls into two broad categories that require different diagnostic approaches: diffuse hepatopathy affecting the entire liver parenchyma, and focal hepatic lesions involving discrete portions of the liver.
Diffuse hepatopathies include chronic hepatitis (inflammatory liver disease leading to fibrosis and ultimately cirrhosis), vacuolar hepatopathy (hepatocellular glycogen or lipid accumulation, common in dogs with hyperadrenocorticism or on corticosteroids), hepatic lipidosis (fat accumulation, the most common severe liver disease in cats and associated with anorexia), and nodular regeneration (irregular nodular remodeling in chronic liver disease). These conditions produce characteristic changes in hepatic echogenicity and size that are detectable on ultrasound, though biopsy is typically required for definitive histopathologic diagnosis.
Focal hepatic lesions include nodular hyperplasia (common benign age-related nodules in older dogs), hepatocellular carcinoma (the most common primary hepatic malignancy in dogs, often arising as a massive single-lobe lesion), hepatocellular adenoma, biliary cystadenoma (common benign cystic lesions in cats), and metastatic disease from primary tumors elsewhere (splenic hemangiosarcoma, pancreatic carcinoma, intestinal tumors, etc.). Ultrasound-guided FNA of accessible focal lesions can provide cytologic information that guides management without surgical intervention.
Signs & Symptoms of Liver Disease
Hepatic disease produces a wide range of clinical signs depending on the severity, acuity, and type of disease. Mild liver disease may produce only subtle bloodwork abnormalities, while severe disease causes overt clinical signs of hepatic dysfunction.
🚨 When Liver Disease Becomes Urgent
Acute hepatic failure, biliary obstruction with ascending cholangitis, spontaneous hemorrhage from a hepatic mass, and hepatic encephalopathy with seizures require emergency evaluation. Ultrasound can rapidly assess biliary distension, free abdominal fluid, and mass characteristics to determine if urgent intervention is needed.
How Ultrasound Evaluates Liver Disease
Abdominal ultrasound provides the most comprehensive non-invasive assessment of the liver available in veterinary medicine, evaluating both structure and enabling tissue sampling for definitive diagnosis.
What Ultrasound Reveals
Diffuse parenchymal assessment — Hepatic echogenicity is compared to the spleen and renal cortex as reference standards. A hyperechoic liver (brighter than spleen) suggests vacuolar hepatopathy or lipidosis. A hypoechoic liver with irregular margins and ascites suggests hepatitis or cirrhosis. Nodular heterogeneity with irregular echogenicity is seen in nodular regeneration and chronic fibrosis.
Focal lesion characterization — Discrete hepatic masses are described by size, location, echogenicity (hypo-, hyper-, mixed), margination, and internal architecture (solid, cavitated, or complex). Large single-lobe masses in older dogs are characteristic of hepatocellular carcinoma. Multiple small nodules may represent nodular hyperplasia, metastasis, or lymphoma.
Biliary system evaluation — The gallbladder and common bile duct are assessed for wall thickening (cholecystitis), biliary sludge, cholelithiasis, mucocele formation, and extrahepatic biliary obstruction (duct dilation). In cats, concurrent pancreatitis and cholangitis (triaditis) are evaluated comprehensively in a single study.
Hepatic vasculature — Portal vein diameter, hepatic vein patency, and arteriovenous fistula detection are assessed. Portal hypertension from chronic hepatic disease causes portal vein dilation and acquired portosystemic shunts that are identifiable on Doppler ultrasound.
Ultrasound-guided FNA and biopsy — Real-time ultrasound guidance allows precise needle placement into focal lesions or diffusely abnormal parenchyma for cytologic or histologic sampling. This provides tissue diagnosis without laparotomy in many cases.
Imaging Comparison for Liver Disease
Ultrasound
Comprehensive hepatic assessment without radiation. Evaluates parenchyma, biliary tree, vasculature, and enables FNA guidance for definitive diagnosis.
CT
Superior for precise mass margins, vascular supply mapping, and lymph node assessment prior to liver lobectomy. Excellent for detecting small metastases.
X-Ray
Detects gross hepatomegaly and large abdominal masses. Cannot assess parenchymal architecture, biliary system, or enable tissue sampling. Insufficient alone.
Which Breeds Are Most at Risk?
Breeds at Higher Risk
Doberman Pinschers have the highest prevalence of chronic hepatitis, an immune-mediated or toxic inflammatory liver disease that progresses to cirrhosis. West Highland White Terriers and Bedlington Terriers are predisposed to copper storage hepatopathy (abnormal hepatic copper accumulation leading to progressive liver damage). Cocker Spaniels, Labrador Retrievers, and Standard Poodles also have elevated hepatitis rates. In cats, hepatic lipidosis affects any breed — particularly obese cats undergoing a period of anorexia — and is the most common severe liver disease in cats. Persian cats have an increased incidence of biliary cystadenoma.
What to Expect During Hepatic Ultrasound
Hepatic ultrasound at Sage Veterinary Imaging takes approximately 20–40 minutes for evaluation alone, with additional time if FNA or biopsy is performed concurrently. Fasting for 8–12 hours before the appointment reduces intestinal gas and gallbladder dilation, improving image quality — your referring veterinarian will provide specific fasting instructions.
Most patients tolerate hepatic ultrasound with gentle dorsal or lateral positioning and do not require sedation. The fur over the cranial abdomen is clipped to optimize transducer contact. If ultrasound-guided FNA is planned, coagulation parameters (platelet count, PT/PTT) should ideally be evaluated beforehand to assess bleeding risk. Board-certified veterinary radiologists at SVI perform and interpret all studies, with same-day written reports and immediate critical findings communication.
Why Choose Sage for Hepatic Evaluation
Schedule a Hepatic Ultrasound
If your pet has elevated liver enzymes, jaundice, or a suspected hepatic mass, abdominal ultrasound provides the comprehensive assessment needed to guide diagnosis and treatment.
Liver Disease Imaging FAQ
Get Answers for Your Pet’s Liver Health
From diffuse hepatopathy to focal masses, Sage Veterinary Imaging provides the comprehensive hepatic ultrasound evaluation and guided sampling needed for accurate diagnosis and optimal care.