2019-29 / SEPTEMBER 2 (CONTRIBUTOR: FRANCESCA KHANI)
A 4 year old boy presented with gross hematuria and a solitary bladder mass was identified on a renal/bladder ultrasound. Cystoscopic biopsy confirmed malignancy, and a partial cystectomy was performed. Representative H&E images and an immunostain for INI1 are shown. The tumor was also negative for pan-cytokeratin, EMA, S100, desmin, myogenin, myoD1, and CD34.
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1. What is the correct diagnosis?
b. Proximal type epithelioid sarcoma
d. Extrarenal malignant rhabdoid tumor
e. Wilms tumor