History of the present illness

This is a 21-year-old white female with a four-month history of radiolucency in the left posterior mandible (Figure 1). This condition started with pain in the area which was interpreted to be endodotically related. Thus, tooth #20 was treated. The patient's past medical history is unremarkable.

Figure 1 This is a panoramic radiograph taken at first clinical presentation. Note the large, well-defined unilocular radiolucency involving area of teeth #s 18-21.