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

After histopathology results were obtained, the cat was prescribed long-term prednisolone therapy (2 mg/kg PO q24h; Akorn). The owner was advised to continue amoxicillin/clavulanic acid (62.5 mg/cat PO q12h) for 1 month to treat the S aureus isolated from the cavitated mass. Repeat abdominal ultrasound at PUVTH was recommended 3 months postoperatively; however, the owner elected to pursue all postoperative follow-up care with the primary veterinarian. The cat continued to have consistent, ribbon-like stool production through the postoperative period and developed no postoperative complications. Three weeks postoperatively, the cat was eating well and had gained approximately 0.9 kg. Seven weeks postoperatively, the abdominal mass was no longer palpable. Six months postoperatively, the cat was alive and doing well, with normal appetite, drinking habits and urination, and production of soft, ribbonlike stools daily. At that time, the cat was medically managed on polyethylene glycol 3350 (~0.5 g/kg PO q24h) and prednisolone (2 mg/kg PO q24h).