骨性迷芽瘤是良性的病變，被一層纖維性軟組織的薄被膜所覆蓋；舌部骨迷芽瘤多發生於後三分之一的舌背側；病理機制為發育上的畸形組織、局部受傷、或經刺激後所產生的反應病變；治療方式為手術切除。此病例為一個57 歲女性在胃鏡檢查中意外發現在其舌根處有一腫塊，病人否認疼痛、腫痛、吞嚥困難或吞嚥疼痛等症狀，牙齒也並不會造成口內局部受傷。口內檢查顯示為一公分大小帶蒂且完整的舌根腫塊，其上覆蓋的黏膜完整。此腫塊經手術切除並送病理化驗，病理報告顯示其為一骨迷芽瘤。

Osseous choristomas are benign lesions. They are well-circumscribed and composed of compact bone with haversian systems. Lingual osseous choristomas are commonly located on the posterior third of the dorsal tongue. The pathogenesis of osseous choristomas may be as a developmental malformation or a reactive lesion after local trauma or irritation. Most osseous choristomas are asymptomatic. Treatment of osseous choristomas is simple excision. A 57-yearold Taiwanese woman had a posterior tongue mass detected incidentally during a gastroendoscopic examination. An intraoral examination revealed a pedunculated, well-circumscribed mass measuring 1 cm in diameter grossly located on the posterior one-third of the dorsal tongue. It was a firm, non-tender mass, that was fixed to the underlying tissue. An excisional biopsy was performed, and the histopathology examination revealed an osseous choristoma.