18F-FDG PET/CT Imaging of Hidradenocarcinoma Arising From Preexisting Hidradenoma of the Knee

Abstract Malignant tumors of the sweat glands are exceedingly rare and aggressive tumors. We present here a case of a 60-year-old man with a malignant hidradenocarcinoma that developed in a background of preexisting benign hidradenoma on the lateral aspect of the knee that was initially resected, but rapidly recurred with associated inguinal lymphadenopathy. 18F-FDG PET/CT was performed as part of preoperative staging, which demonstrated abnormal inguinal lymph nodes and metastatic disease to the lungs. FDG PET/CT can play an invaluable role in the initial staging and follow-up of this rare malignancy. Received for publication September 25, 2017; revision accepted October 29, 2017. Conflicts of interest and sources of funding: none declared. Correspondence to: Tirth V. Patel, MD, Department of Radiology, University of North Carolina School of Medicine, 2107 Old Clinic, CB #7510, Chapel Hill, NC 27599. E-mail: Tirth.Patel@unchealth.unc.edu. Copyright © 2017 Wolters Kluwer Health, Inc. All rights reserved.

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