This week’s case is a 12-year-old male neutered Labrador Retriever who is straining to urinate and defecate. Hypercalcemia was noted on serum biochemistry. Where is the abnormality?
Findings
There is a large, lobular, soft tissue opacity mass in the caudal retroperitoneal space. The colon is displaced ventrally, and is distended with fecal material. The bladder is enlarged and cranially displaced. The peritoneal detail is good. The liver, spleen, and kidneys are normal in size and shape. No abnormalities are noted in the stomach or small intestine. There is spondylosis deformans at the lumbosacral space.
Differential Diagnosis
Sublumbar lymphadenopathy – metastatic disease from pelvic neoplasia, lymphoma
Diagnosis
Metastatic anal sac adenocarcinoma