An Impressive Widespread Sarcoid Myopathy in 18F-FDG PET/CT.

Sarcoidosis is a systemic granulomatous disease of unknown etiology, primarily affecting the lungs and the lymphatics. Painless and impalpable diffuse sarcoid myopathy is very rare and may represent a diagnostic challenge even for expert physicians. We present the 18F-FDG PET/CT findings of a 77-year-old woman with muscular sarcoidosis manifested by non-parathyroid-related hypercalcemia. 18F-FDG PET/CT alone among conventional imaging studies provided clues for the diagnosis.