Primary lymphoma of the urinary bladder presenting as a large pelvic mass.

Primary lymphomas of the urinary bladder is a fairly uncommon entity, whereas urinary tract involvement is reported in up to 13% of the cases with advanced systemic disease 1 , Primary malignant lymphoma of the urinary bladder was first described in 1885 and marked female preponderance is reported with a female to male ratio of 6.5:1 2 . The most common types of primary lymphoma of the urinary bladder are extranodal marginal zone lymphoma of mucosa associated lymphoid tissue type (MALT-type lymphoma) and diffuse large B cell lymphoma. Development of lymphomas in a site normally not including lymphoid tissue is explained by the MALT concept, which was first described by Isaacson and Wright in 1983 3 . In this paper we report a 58 years old woman with primary high grade B type malignant lymphoma who presented with genitourinary bleeding and a large pelvic mass appearing as a gynecologic tumor.