선천성 진주종으로 오인된 중이 내 골연골종 1예

The first impression could be congenital cholesteatoma, when we saw a pearl-like material behind an intact tympanic membrane in child. The pateint was a 4-year-old male with incidentally known intratympanic mass with intact tympanic membrane. During exploratory tympanotomy, We removed whitish mass from middle ear. The specimen disclosed an ossified cartilage without squamous cell or keratin material. We report a case of osteochondroma in middle ear which could be misconceived as congenital cholesteatoma. (J Clinical Otolaryngol 2008;19:205-208)