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Objective: Sesamoid and accessory bones are commonly found in the foot and ankle with varying incidence. The Os intermetatarsium, located between the medial cuneiform and the base of the first and second metatarsal, occurs rarely and is frequently asymptomatic. Few symptomatic cases of this condition are reported in the literature. The development of synovial ganglion cyst over an os intermetatarsium is a more occasional finding not clearly reported in the literature.
Case: Here we report the case of a 22 year old female presenting with pain and localized swelling in the dorsum of the midfoot who was found to have a ganglion cyst emerging from an articulating os intermetatarsium.
Conclusion: Although not a common entity, an Os intermetarsium, with its associated complications, can be one of the causes of dorsal foot pain.
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