4.6 Editorial Material

Unilateral Suppression of Brown Fat on FDG PET/CT in Horner Syndrome

Journal

CLINICAL NUCLEAR MEDICINE
Volume 41, Issue 10, Pages 797-798

Publisher

LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/RLU.0000000000001319

Keywords

FDG; PET/CT; Brown Fat; Horner's Syndrome

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A 29-year-old woman underwent resection of a left anterior mediastinal thymoma and pleurectomy. Postsurgical (18)FDG PET/CT scan demonstrated FDG avidity in the right neck and upper thoracic fat but relatively absent FDG-avid fat in the left neck and upper thorax. Bilateral FDG-avid fat was also apparent in the lower chest and upper abdomen. After surgery, the patient demonstrated Horner syndrome, with left-sided ptosis, miosis, and facial anhidrosis. It is hypothesized that left-sided sympathetic nerves were compromised during surgery, leading to Horner syndrome and denervation of ipsilateral brown fat. The unilateral FDG avidity should not be mistaken for malignancy.

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