Differentials for the mass effect in the caudal abdomen should include sublumbar lymphadenopathy secondary to metastatic neoplasia, and less likely infectious disease, abscess, or hematoma.
Origin of the mass may be lymph node, musculature, vascular or neural. Differentials would include neoplasia and infectious disease (granulomatous). A fine needle aspirate was obtained with no periprocedural complications.
L. Armbrust, DVM, 2nd year radiology resident
Apocrine gland adenocarcinoma