nasal glioma nasal glioma nasal glioma is a rare benign congenital lesion, usually a firm, incompressible, reddish-blue to purple lesion occurring on the nasal bridge or midline near the root.: 622 nasal gliomaother namesnasal glial heterotopia, brain-like heterotopia, cephalic brain-like heterotopia," glial hamartoma, nasal cerebral heterotopia," heterotopic neuroglial tissue, and nasal heterotopic brain tissuenasal glioma, seen on t2-weighted coronal mri