A Case of Prostatic Lymphoma in a Dog with Symptoms of a Uroperitoneum Evaluated with Ultrasonography and Fluoroscopy.

A 10-year-old neutered male Labrador mix dog presented with a few-day history of stranguria and dysuria. Results of physical examination, laboratory findings, and imaging were consistent with a uroperitoneum and prostatomegaly. Ultrasound showed an enlarged, heterogeneous, and lobular prostate with mineralization, and fluoroscopy showed extravasation of contrast from the prostatic urethra through the prostatic parenchyma into the abdomen. The dog was diagnosed with prostatic lymphoma via cytology and ultimately euthanized. This is the first report of prostatic lymphoma with a concurrent uroperitoneum due to urine leakage from the prostatic urethra through the prostatic parenchyma and capsule into the abdomen.