We report a case of a 27-year-old man who presented with a progressive painful swelling at the base of his left index finger, with radiographs and a computed tomography scan revealing a lytic lesion of the proximal phalanx. Following further investigation, the patient underwent a bone biopsy that revealed a florid noncaseating granulomatous chronic inflammatory infiltrate, compatible with sarcoidosis. Osseous sarcoidosis of the hand is uncommon and, in the absence of significant systemic disease, is rarely the primary presenting feature. Early diagnosis and treatment of such undetermined bone pathology, via referral to a regional musculoskeletal tumor service, can prevent significant future complications.
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