[Plasmocytoma of the ureter--a rare cause of hydronephrosis: case report and review of the literature].

INTRODUCTION: Plasmocytoma is an aggressive B-cell lymphoma with diffuse and multi-located-infiltration of the bone marrow. There are only a few cases in the literature reporting an extraosseous manifestation of plasmocytoma, e. g., in the urinary tract. CASE REPORT: We report on an 80-year-old female patient with known plasmocytoma presenting with renal colics. Ultrasonography demonstrated marked hydronephrosis and retrograde pyelography disclosed a short and filiform stenosis of the ureter. Surgical exploration revealed an infiltration of the distal ureter by the known plasmocytoma. The affected ureter segment could be removed completely and ureterocystoneostomy was performed successfully.
CONCLUSIONS: To the best of our knowledge, we present the first case of an isolated plasmocytoma of the ureter. Although extremely rare, it should be considered as a differential diagnosis of circumscribed ureteral strictures.