[A case of secondary malignant lymphoma of the urinary bladder].

A case of secondary malignant lymphoma of the urinary bladder is presented. Clinical diagnosis was metastatic small cell carcinoma in urinary bladder. Pathological diagnosis after autopsy, however, revealed vesical involvement of malignant lymphoma. The primary focus was considered to be the lung, the biopsy specimen of which was initially diagnosed as small cell carcinoma, because clinical manifestation first occurred in the lung and the metastasis to subcutaneous tissue, bladder and other abdominal organs was found subsequently. In a study of secondary involvement of genitourinary organs as seen in the present case, we reviewed 303 patients who had died of malignant lymphoma at our institute between 1960 and 1985.