[A case of retrovesical abscess due to Crohn's disease].

A 29-year-old man was admitted with pain on urination and high grade fever-up. Mass was palpated above the right lobe of prostate. Cystoscopy revealed an edematous region in the upward to the right ureteral orifice. CT revealed the retrovesical mass in the same region. The surgical specimen obtained by transurethral resection showed severe inflammatory changes, but no malignancy was found. Antimicrobial chemotherapy had been continued, but the mass did not disappear on palpation and computed tomography and cystoscopy revealed pus-discharge from the center of the edematous region was found. An operation was performed under the diagnosis of retrovesical abscess. The terminal ileum had formed adhesion to the posterior bladder wall. Segmental resection of the ileum and partial resection of involved segment of the bladder were performed. The pathological diagnosis was Crohn's disease. Inflammation of ileum seemed to infiltrate the bladder wall and formed an abscess. After the operation symptoms disappeared.