College of American Pathologists
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2009 — May Case of the Month

Updated April 29, 2009


CAP Foundation May 2009 Online Case of the Month

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A 2-year-old boy presented with a distended abdomen and was discovered to have a right-sided abdominal mass. Following appropriate workup, a renal tumor was removed. A 13.0 x 11.0 x 9.0 cm, 810.0 gm right kidney and adrenal gland was submitted for examination. Cut surfaces demonstrated that the kidney was virtually replaced by a variegated and focally necrotic tumor, which was confined to the kidney by an intact capsule. Sections of tumor extending into the renal hilum exhibited tumor invading lymphatics and venules in the soft tissues supporting renal calyces.

The master list with the correct answer

  • Clear cell sarcoma of kidney
  • Congenital mesoblastic nephroma
  • Malignant rhabdoid tumor of kidney
  • Neuroblastoma, poorly differentiated
  • Peripheral primitive neuroectodermal tumor (PNET)
  • Wilms tumor

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  • Appropriate diagnosis
  • Critique
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