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Osseous choristoma of the eye is a rare entity with few case reports being published in the literature. We report one such case in a 14-year old female who had a small growth in the right eye present since birth, which gradually increased in size. Excision biopsy was done. Histologically, the mass was composed of mature bone with surrounding benign adipocytes.

Osseous choristoma is a normal bone tissue in an ectopic position. These are slow growing lesions that are usually completely asymptomatic and only present when there is a disruption in the function of the organ due to its large size as it grows. Definitive diagnosis is obtained only after the histopathological examination. The etiology remains still questionable. The treatment of choice is surgical excision. Here we report a case of choristoma in the lower labial mucosa in a 47-year-old female.

Osseous choristoma is a rare, benign lesion of the oral cavity occurring usually on the tongue. It appears as a tumorous mass of normal bony structure with mature cells in an ectopic position. Some lesions represent developmental malformations, whereas others may be reactive lesions, after trauma or chronic irritation. This is the first ever reported case of an osseous choristoma of the periodontium in the lingual aspect of posterior mandible.