Today’s case is a 10-year-old male castrated domestic short haired cat. Weight loss and muscle wasting for one year. Take a look and post your comments.
- cranial abdominal mass
- caudal displacement of the stomach and altered gastric axis
- caudal displacement of transverse colon
- caudal displacement of the right kidney
- lobular mass cranial and caudal to stomach
On ultrasound, the mass was originating from the liver. It was lobular and mottled, with hyperechoic areas.
- primary hepatic neoplasia
- biliary cystadenoma
- granauloma/abscess (less likely)
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. Remember that the right kidney is in contact with the liver in the renal fossa.
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.