Schwannoma of unusual location in oral cavity: case report

A 22-year-old female patient reported edema on the floor of the mouth, without painful symptoms. The patient's medical history included systemic arterial hypertension. In the oral cavity, there was an increase in volume, firm on palpation, located on the right floor of the mouth, measuring approximately 4.0 × 3.0 cm, with well-defined limits, coloration similar to the normal mucosa, with evolution of 1 year and episodes of partial regression. Panoramic radiography, occlusal radiography, and ultrasound of the region showed no changes. Incisional biopsy was performed with a diagnostic hypothesis of a ranula. In the histopathologic analysis, sections stained with hematoxylin and eosin revealed a benign lesion of loose connective tissue slightly myxoid, suggesting mucocele (with possible fibrosis) or myxoma. Total surgical excision was performed under local anesthesia and the new histopathology was conclusive for schwannoma. The patient is being followed up and after 6 months there are no signs of recurrence of the lesion.