Bilateral fused os intermetatarseum presenting as dorsal foot pain: a case report

Os intermetatarseum is a rare accessory bone of the forefoot and usually situated between the base of the first and second metatarsals. Most of the cases are asymptomatic and diagnosed incidentally. Here, we report a rare form of os intermetatarseum presented with bilateral dorsal foot pain and to the authors' knowledge, it is the first case which includes computerized tomography (CT) and magnetic resonance imaging (MRI) findings.

A 23-year-old male complained of localized bump at the dorsum of the both feet underwent bilateral anteroposterior foot radiograms which was unremarkable and then CT and MRI were performed.

MRI of both feet demonstrated osseous structures in relation with medial os cuneiforme. Computerized tomography demonstrated bilateral os intermetatarsea fused with medial os cuneiforme.

It is important for radiologist to know that os intermetatarseum can be presented as dorsal foot pain. Due to its position, it is difficult to demonstrate os intermetatarseum in plain radiographs, CT and MRI should be performed in clinically suggestive cases.