A 13-year-old girl presented with a 6-month history of a recurrent single erythematous nodule on her right cheek associated with periodic drainage of inflammatory exudate. The patient did not have any discomfort or history of trauma or infection. Physical examination revealed a well-defined soft erythematous nodule about 1cm in diameter in her right mandibular angle (figure 1A). Skin biopsy from the lesion showed non-specific chronic inflammation (figure 1B). The sagittal T2 STIR MRI images showed that the sinus tract extended from the right mandibular first molar tooth (#46, figure 2A), passed through the muscles into the subcutaneous fat and reached the skin, forming a bulging nodule (figure 2B).
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