Sebaceous cyst in the oral cavity
The following case report appears in the journal Annals of Maxillofacial Surgery.

A 22-year-old male reported with a slowly enlarging painless swelling in the upper lip. This lesion, with 12-month evolution, was not associated with trauma, previous surgery, or systemic disease. Clinically, it was a swelling in the upper lip, with the disappearance of the nasolabial groove and elevation of the nasal wing.

This lesion was palpable immediately beneath the labial mucosa, well circumscribed, 2 cm in size, mobile, covered with normal mucosa, slightly depressible, and under pressure a light brownish area could be seen beneath the oral mucosa. A panoramic and periapical radiograph confirmed no teeth or upper maxilla association with the pathology.

The lesion was presumably diagnosed as nasolabial cyst, and differentially diagnosed as lipoma, neoplastic process of secondary salivary gland, and free sebaceous cyst. Surgery was performed under local anesthesia, and the lesion was totally enucleated, meticulously dissecting circumscriptive tissues.

The wound was closed with 3.0 silk sutures. The resected tissue was fixed in formalin to send to histopathological examination. The postoperative period was uneventful. During the histological study, it was stained with hematoxylin and eosin, revealing lined keratinizing stratified squamous epithelium with attached sebaceous gland acini and inflammatory cells in the chorion.

It was diagnosed as a free sebaceous cyst. No recurrence of the pathology was reported during a 3-year observation period.

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