MELANOTIC NERVE SHEATH TUMOR OF THE GASSERIAN GANGLION AND TRIGEMINAL NERVE

This melanotic nerve sheath tumor, which involved the gasserian ganglion and trigeminal rootlets, is unique pathologically, and it demonstrates certain CT characteristics that may suggest correct preoperative diagnosis. Although the finding of increased attenuation on plain CT is most likely due to calcification, hemorrhage, compact tumor tissue, or an area of high blood flow, a densely pigmented melanin-containing lesion should also be considered.