Primary intrarenal yolk sac tumor
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Yolk sac tumor (endodermal sinus tumor) (YST) is a malignant germ cell tumor that usually arises in the gonads. Rare occurrence of extragonadal germ cell tumors is known to occur in the mediastinum, retroperitoneum, sacrococcygeal region, and pineal gland. We report an isolated intrarenal YST in an adult who presented with a renal mass.A 43-year-old male presented with left upper abdominal pain, mildly tender palpable mass, normal genitals, and unremarkable previous surgical issues. Imaging revealed bilateral renal calculi along with grossly enlarged, calculi laden, hydronephrotic left kidney, intrarenal mass lesion of the renal pelvis, and perinephric stranding. Multiple enlarged necrotic retroperitoneal nodes were noted.With the clinical suspicion of xanthogranulomatous pyelonephritis with squamous metaplasia/carcinoma, open left radical nephrectomy, and excision of palpable retroperitoneal nodes was performed...

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