Sternoclavicular joint arthritis as the initial presentation of sarcoidosis.

Sarcoidosis is a multisystem granulomatous disease of unknown etiology. It can affect the musculoskeletal system in the form of acute and rarely, in the form of chronic peripheral arthritis involving bilateral small and large joints. Axial joint involvement with sarcoidosis is rare. Herein we report a case with sternoclavicular joint arthritis as the initial presentation of sarcoidosis. This report aims to demonstrate a rare initial presentation of sarcoidosis and highlight the importance of considering sarcoidosis as a differential diagnosis in patients presenting with sternoclavicular joint arthritis.