Intra-osseous Schwannoma of Mandibular Symphysis: A Rare Case Presentation

Aim: To describe a rare presentation of intra-osseous schwannoma of mandible.

Presentation of Case: A rare representation of diffuse non-tender swelling at parasymphysis of mandible with bicortical expansion and negative aspiration on FNAC. A complete wide surgical enucleation of soft, doughy mass was done through intra-oral papilla preservating flap followed by suitable dissection preserving the vital nerves and vessels in the vicinity was done. Histopathologically the tissue tumor mass arranged in Antoni A pattern showing Verocay bodies formed by streaming fascicles of spindle shaped schwann cells forming palisade arrangement around central acellular, eosinophic areas.

Discussion: Neurilemmomas is a typical histopathological finding with typical histological features includes Antoni A areas, Antoni B areas, or both. Antoni A regions have high cellularity and are composed of densely packed spindle cells arranged in palisades. On the other hand, Antoni B regions have more myxoid structures and two palisading rows of aligned nuclei in an eosinophil zone.

Conclusion: Intraosseous lesions located in the peripheral region with non-specific clinical and radiographic features often lead to diagnostic confusion. Most of the lesions located in the environs of the teeth are odontogenic in origin. Yet, other possibilities like intraosseous scwhannomas must be considered.