A sixteen year old female with a six year history of discomfort and pain in the left body and angle of the mandible during which time the first and second molar teeth had been extracted. Prior dental records including radiographs were not available. She had a slight clinical swelling of the left cheek. Intra-oral examination revealed both buccal and lingual expansion of the mandible in the retromolar area. No lymphadenopathy was detected.