There are many reports on cases of vestibular schwannoma arising in the cerebellopontine angle that were detected because of hearing loss or sudden deafness. We herein report a case of a vestibular schwannoma in the cerebellopontine angle that was associated with the initial symptoms of hypoesthesia of the lower lip and skin on the chin.
A 55-year-old woman presented to our department with hypoesthesia of the lower lip and the skin of her chin. Intraoral X-ray film and CT revealed a radiolucent image close to the mandibular canal in the apical area of the left mandibular second molar, and apical periodontitis of the left mandibular second molar was diagnosed. Root canal treatment was performed; however, 7 days after treatment, hypoesthesia spread to the skin on the left half of her face and tongue. An intracranial lesion was suspected, and MRI was performed. A 40-mm long well-circumscribed lesion was found on the left side of the cerebellopontine angle. The patient was referred to the neurosurgery department of a local hospital, and a brain tumor was diagnosed. The tumor was resected with the patient under general anesthesia, and histopathological examination confirmed a schwannoma. Postoperatively, the hypoesthesia resolved. There has been no recurrence as of 3 years postoperatively; the patient is making good progress.
