Extraosseous schwannoma of the mental nerve clinically simulating intraosseous

Abstract

We report a case of a benign neurilemmoma arising from the right mental nerve. Schwannomas are rare neurogenic tumours that originate from Schwann cells of the peripheral nervous system. Frequent locations are the head and neck region. Most of the tumours occur in the soft tissue whereas intraosseous schwannomas are rare. This case report deals with a young patient who was referred to our hospital with an unidentified fast-growing tumour located mainly in the premolar region of the right mandible. The tumour presented as an expansive, unilocular, well defined, radiolucent lesion on orthopantomography. No expansion of the mandibular canal could be seen. Computerized tomography scans of the mandible helped to identify the solid nature of the tumour. A biopsy was necessary to make the final diagnosis and the tumour was then excised surgically. Postoperative magnetic resonance imaging scans and a histological examination of the surgical specimen showed no signs of neurofibromatosis type 2.

Schwanomma arising from mental nerve: a rare entity

“…9 There are only a few isolated case reports of schwanommas arising from mental nerve. 10 Although we did not identify the nerve of origin intra-operatively, the presence of postoperative hypoesthesia over chin and lower lip indicates the origin of tumour from mental nerve.…”

Unilaterally Enlarged Mandibular Foramina and Canal Associated With Hyperplastic Lymphatic Tissue of Inferior Alveolar Nerve: Case Report and Short Literature Survey

“…The differential diagnosis of enlarged foramen and canal is manifold and includes lymphoma (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21), peripheral nerve sheath tumor (22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34), primary sarcoma (35)(36)(37)(38), locally invasive carcinoma of the mucous membranes (39)(40)(41)(42)(43)(44)(45), distant metastasis (46,47), osteomyelitis (48), lipoma (49,50), hemangioma (51), idiopathic (52) and iatrogenic (53) bone defects, as well as various syndromes (54)(55)(56). Unilaterally enlarged mental foramen on a radiograph is suspected to indicate an underlying neoplastic process, predominantly tumors arising from lymphatic or nerve sheath cells…”

Intraosseous schwannoma; a case report and short review

“…Radiographically, schwannomas of either jaw are well‐demarcated, unilocular radiolucencies with a thin sclerotic border 8 . Additional features such as external root resorption, cortical thinning, cortical thickening and expansion may also be seen 1 .…”