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An 18-year-old man in good overall health was seen by his general dentist with an expansile, radiolucent lesion of the right posterior mandible. The patient stated that he noticed a right-sided facial swelling, which he described as “growing rapidly,” over the past week (although the exact duration of the lesion was unknown). He was unaware of any facial asymmetry or fullness before the past week, and he denied any associated pain or discomfort. Intraorally, the mandibular right gingiva showed buccal and lingual cortical expansion in the area of the first and second premolars (teeth nos.