Solitary Fibrous Tumor of the Hypoglossal Nerve

causing isolated hypoglossal nerve palsy. The neuroimag-ing appearance of the tumor was indistinguishable from that of schwannoma or meningioma. Immunohistochemi-cal tests demonstrated strong reactivity for CD34 but an absence of staining for S100 and epithelial membrane an-tigen; this profile is indicative of an SFT. SFTs are mesen-chymal tumors that can affect the dura-covered segments of cranial nerves. They may be considered in the differen-tial diagnosis of an isolated cranial nerve palsy. Isolated hypoglossal nerve (cranial nerve XII) palsy is an uncommon clinical presentation, and tumors of cranial nerve XII are rare. We describe a solitary fibrous tumor (SFT) of the hypoglossal nerves. This is a rare mesenchymal, nonmeningothelial tumor that may occur in the CNS. To our knowledge, this is th