Calcaneal osteoid osteoma

Case contributed by Ayaz Hidayatov

Presentation

A young male presented with foot pain, especially in the evening and at night. No history of severe trauma.

Patient Data

Age: 15-20 years
Gender: Male
mri

MRI of the ankle reveals extensive bone marrow edema at the calcaneus. A focal subcortical well-defined ovoid lesion at the superolateral aspect of the calcaneus. The lesion shows a mildly hyperintense signal on T1WI and a hypointense signal on PDWI.

A mild retrocalcaneal bursal effusion was also noted.

ct

A small rounded well-defined nidus at the superolateral aspect of the calcaneus with mild surrounding sclerosis. The findings are most suggestive of osteoid osteoma. 

Case Discussion

Osteoid osteoma is a benign bone tumor. This tumor often arises at the diaphysis or metaphysis of long bones. Osteoid osteoma in short bones such as tarsal bones is a rare entity. CT is a superior method for demonstrating a well-defined nidus. 

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