Primary Retroperitoneal Transitional Cell Carcinoma - A Rare Clinical Entity.

CASE DESCRIPTION A 30 year-old male patient belonging to Asian-Indian race presented with intermittent left flank pain for 2 months with normal abdominal examination findings. The patient was a farmer by occupation and did not have any history of radiation exposure or any known family history of malignancy. Ultrasonography along with intravenous urography (IVU) (Figure 1A) revealed hydronephrotic left kidney suggestive of pelvi-ureteric junction obstruction (PUJO) and diuretic renogram showed obstructive drainage from the left kidney. However, on careful retrospective evaluation of IVU plates there was evidence of upper ureteric compression with mild lateral deviation of left ureter which we missed preoperatively. With preoperative diagnosis of left PUJO, the patient was taken up for pyeloplasty and on table retrograde pyelogram (pyelogram) exhibited patent ureter with jet sign at pelvis which collabo-