Multiple Hypermetabolic Subcutaneous Lesions From Hidradenitis Suppurativa Mimicking Metastases on 18F-FDG PET/CT

Abstract Hidradenitis suppurativa is an inflammatory disease associated with subcutaneous nodules/abscesses that occur commonly in the axillary, inguinal, and perineal regions. We describe a case of a 64-year-old man presenting for 18F-FDG PET/CT for staging of a left vocal cord squamous cell carcinoma. The scan showed uptake in the left vocal cord malignancy and multiple hypermetabolic subcutaneous foci in the right axilla, right buttocks, and scalp in known locations of skin lesions related to hidradenitis suppurativa. This case illustrates an unusual inflammatory cause of 18F-FDG incidental uptake that should not be mistaken for metastases. Received for publication September 19, 2017; revision accepted November 1, 2017. Conflicts of interest and sources of funding: none declared. Correspondence to: Daniel J. Wale, DO, 2215 Fuller Rd, D748, Ann Arbor, MI 48105. E-mail: dwale@med.umich.edu. Copyright © 2017 Wolters Kluwer Health, Inc. All rights reserved.

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