History of the present illness
This is a 28-year-old Asian male of slender build.  He first presented on August 8, 1990 with a large anterior mandibular expansion.   A panoramic radiograph (Fig 1) demonstrated a large, well defined unilocular radiolucency in the anterior mandible between teeth #s 22 and 28.  This lesion was expansile and was displacing and resorbing teeth; it was otherwise not painful and the patient was not aware of its duration.  Previous radiographs were not available for review.   Despite thorough curettage, this lesion recurred in 1992 and again in 2005.  The patient is in good general health, has no allergies and is not taking any medications.  The lesion has not caused him any pain to date.