An incidental finding of an asymptomatic intraneural glomus tumor: A case report and review of the literature.

Glomus tumors are rare, soft-tissue neoplasms arising from the thermoregulatory neuromyoarterial glomus bodies. They are commonly observed in the extremities and typically present with symptoms of cold hypersensitivity, pain and localized tenderness. Intraneural glomus tumors (INGTs) are even rarer. Here we review the literature on INGT and present an unusual case of an asymptomatic INGT, found incidentally within the excision specimen of a spiradenocarcinoma that arose near the natal cleft. Interestingly, this had not been identified on magnetic resonance imaging (MRI) used to investigate the spiradenocarcinoma. Although glomus tumors are usually considered benign, malignant transformation has been reported, highlighting the need for reporting pathologists and treating clinicians to be aware of this entity.