1997 Volume 36 Issue 2 Pages 211-215
The patient was a 41-year-old female who developed sudden right flank pain. Examination by ultrasonography, pyelography and CT-scan disclosed hydronephrosis and a mass involving the ureteropelvic junction and measuring 2×5 cm. No abnormal cells were found on urine cytology. Right pelvic urine obtained during ureteroscopy showed a few large lymphoid cells appearing in the inflammatory background. Due to the paucity of suspicious cells and the inflammatory background, a specific diagnosis could not be made by cytological examination alone. Histological and immunohistochemical examination of the biopsied mucosa disclosed a diffuse large cell lymphoma of B cell type. No other lymphomatous localizations were found by subsequent roentgenologic and hematologic examinations, and the diagnosis of primary malignant lymphoma of the ureteropelvic junction was made.
