Primary vesical malignant lymphoma of histiocytes detected by urine cytology

Urinary cytology performed in a woman aged 64 revealed an uncommon cell population with malignant features highly suggestive of a lymphoma. Histologic and immunohistochemical investigations of a polypoid endovesical mass surgically resected showed a lymphoma of histiocytes in the lamina propria of the bladder wall. Clinical, operative and pathologic staging demonstrated that the tumor was confined to bladder. The case repeats the typical features of primary vesical lymphoma reported in the literature. The favourable follow up six years after surgery confirms the good prognosis of bladder Iymphoma treated by aggressive therapy.