Presentation
Presented with weight loss and muscle wasting for one year.
Patient Data
There is a lobular cranial abdominal mass that displaces the gastric axis caudally. The mass also displaces the transverse colon and right kidney caudally and appears to be originating from the liver.
A mixed echogenic mostly hyperechoic large mass is present involving the right side of the liver. The gallbladder and normal liver is present to the left of this mass.
Case Discussion
Liver mass: biliary cystadenoma.
The caudal displacement of the stomach makes a liver mass most likely in this case. The mass is also visible caudal to the stomach, but this can occur with pedunculated, lateralized, or very large masses.
The caudal displacement of the transverse colon and right kidney also point to a hepatic mass.
The mostly hyperechoic appearance of this mass on ultrasound is caused by very small cysts. They can't be seen because of their size, but being filled with fluid, they still produce distal acoustic enhancement.
In older cats, both benign and malignant masses should be included on the list of differential diagnoses. Biliary cystadenoma is one of the most common tumors of older cats and is benign. However, multiple masses in a feline liver are far more commonly neoplastic than in dogs, since cats are not prone to benign nodular hyperplasia.
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