Osteoid Osteoma of Distal Phalanx of Middle Finger-A Diagnostic Dilemma.

Osteoid Osteoma is benign bone forming tumor which commonly occurs in long bones of lower limb. Presence of these rare tumors in the distal phalanx of the digits of the hand is considered a rare phenomenon. In hand, they usually present as chronic pain, swelling, nail enlargement and increase in size of digit. Diagnosis is challenging with clinical examination and usual imaging modalities and often confused with glomus tumor, enchondroma, infection, trauma and rheumatic disease. Surgical excision of the tumor, if present in hand, is the treatment of choice that aids in coming to the exact diagnosis too. The aim of the paper is to report yet another uncommon case of osteoid osteoma of distal phalanx of middle finger mimicking glomus tumor.