Diagnosis and management of a case of retroperitoneal eosinophilic sclerosing fibroplasia in a cat

Thieme, Maureen E; Olsen, Anastasia M; Woolcock, Andrew D; Miller, Margaret A; Simons, Micha C

Abdominal CT with triple-phase contrast and 1.25 mm slice thickness was performed ( Figure 2 ), which revealed an extensive (10.2 cm × 3.0 cm), multi-lobulated, heterogeneous, soft tissue mass present in the caudal abdomen extending into the pelvic canal dorsal to the rectum and urethra and continuing caudally just cranial to the anus. Multiple lobules of the mass were peripherally contrast enhancing with non-enhancing areas centrally. A few small mineral-attenuating foci were present within the center of the mass. The cranial aspect of the mass displaced the right ureter ventrally. At the level of the sacrum, the descending colon was displaced ventrally and narrowed, and the dorsal margin was confluent with the mass. The colon orad to the mass was feces-filled. The mass extended into the gluteal muscles at the level of the caudal sacrum, dorsal to the ileum bilaterally. There was medial iliac, inguinal, jejunal, gluteal and colic lymphadenomegaly with no contrast enhancement seen. A mild amount of peritoneal effusion was also noted.