[Pain in the lower limb as a manifestation of an osteoid osteoma. Apropos of 2 cases].

The case history of two young men suffering from osteoid osteoma is described as follows. The clinical features, the mechanism of pain, the differential diagnosis, investigations and treatment are discussed in accordance with the recent review of the literature. The OO is a benign bone tumor, with no systemic signs characterized by nightly pain which is greatly improved by small doses of NSAID. Mostly young men between 10 and 20 years suffer from this lesion which can be completely cured by surgical excision of the nidus en bloc.