May 2018 — Genitourinary

A 60-year-old man presented with flank pain while passing a kidney stone. CT of the abdomen and pelvis showed left and right renal masses in a horseshoe kidney.

He subsequently underwent partial nephrectomy with removal of the left mass. By gross examination, there was a 0.9 x 0.7 x 0.5 cm well circumscribed mass with yellow-tan cut surface, located within 0.3 cm of the parenchymal resection margin.

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10-Chromogranin & Synaptophysin
11-Thyroglobulin TTF-1
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Mira Lotfalla, M.B., B.Ch.
Resident, Anatomic Pathology
Mayo Clinic
Loren Herrera Hernandez, M.D.
Consultant, Anatomic Pathology
Mayo Clinic
Assistant Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine
MCL Education (@mmledu)

MCL Education

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