Bilateral intrarenal pelvis Wilms' tumor with fibroepithelial polyp

Bilateral Botryoid Wilms Tumor presented with acute renal failure

Botryoid Wilms tumors are intrapelvic polypoid masses that are uncommon feature of Wilms tumor. The authors reported a rare case of bilateral botryoid Wilms tumor in a 19-month-old boy who admitted to hospital with acute renal failure secondary to hydronephrosis caused by bilateral botryoid Wilms tumor with ureteral extension. The patient was successfully treated with chemotherapy and bilateral nephron sparing surgery in 2 separate operations. During 15 months follow-up, no evidence of recurrence or metastasis was found.

Bilateral botryoid nephroblastoma: a rare cause of renal failure

The authors describe the case of a 16-month-old girl who presented with bilateral hydronephrosis and renal failure secondary to bilateral renal pelvic botryoid Wilms' tumour (nephroblastoma). The term 'botryoid' describes an intrapelvic polypoid renal Wilms tumour, either extending from the renal parenchyma or primarily pelvis-based tumour. Both tumours filled the renal pelvis and extended down the proximal ureter, with no intraparenchymal tumour seen. Bilateral intralobar nephrogenic rests were present. Histological examination demonstrated triphasic nephroblastoma, with focal rhabdomyomatous differentiation of the stromal element bilaterally. Postchemotherapy, the patient underwent bilateral nephrectomy. Post complete resection of her bilateral disease, this patient has had an excellent outcome. This is only the third reported case of bilateral botryoid Wilms' tumour. While the condition is extremely rare, it should be included in the differential diagnosis of a young child with bilateral renal pelvic masses.

Adult wilms tumor in the renal pelvis: case report with review of the literature

An 84-year-old man was referred to our hospital with gross hematuria. Abdominal computed tomography demonstrated a well-circumscribed enhanced mass in the right pelviureteral junction. Retroperitoneoscopic nephroureterectomy was performed because of a clinical diagnosis of renal pelvic carcinoma. Pathologic examination led to a final diagnosis of an adult Wilms tumor arising from the renal pelvis. This is the first report of a Wilms tumor in the renal pelvis of an adult patient.