[A case of primary malignant lymphoma of the bladder].

A case of primary malignant lymphoma of the bladder is reported. A 61-year-old female visited our outpatient clinic with the chief complaints of asymptomatic grosshematuria and was recognized as having a bladder tumor by abdominal ultrasonography. On cystoscopic examination, the tumor was non-papillary and dome-like in shape. Computed tomography revealed that the bladder tumor was invading into the bladder wall. The histopathological study of endoscopic biopsy specimen revealed malignant lymphoma. After further examinations, it was diagnosed as primary malignant lymphoma of bladder, stage IE (Ann Arbor classification). Four courses of CHOP regimen (cyclophosphamide, vincristine, doxorubicin, predonisolone) was performed and no lymphoma cell was found by re-biopsy at the primary site. No local or distant recurrence was found during the 15 months' follow up.