Simple bone cyst: a radiological dilemma.

An asymptomatic cystic lesion in the corpus region on the right side of the mandible was detected in a panoramic radiograph of a 13-year-old girl, taken for orthodontic reasons. MR examination revealed a cavity filled with fluid and thin-rim peripheral contrast enhancement of the lesion similar to an odontogenic cyst lined with epithelium. The clinical and histological diagnosis of the lesion was a simple bone cyst. This report demonstrates the confounding similarity of the MR findings of a simple bone cyst to an odontogenic cyst.