<unk> s are composed of dysplastic glial tissue, and are congenital nonneoplastic lesions best categorized as heterotopia.<unk> s occur near the root of the nose (where the cranial portion of the nose joins the forehead). A<unk>  may be connected to the brain by a stalk of tissue in up to 15% of cases, but the stalk does not contain a direct fluid-filled tract that communicates with the subarachnoid spaces; therefore, a<unk>  is distinct from an encephalocele.<unk> s are intranasal in 30% of cases, extranasal in 60%, and mixed in 10%. Extranasal<unk> s are usually seen in a paramedian location at the bridge of the nose external to the nasal passage , whereas intranasal lesions are usually located within the nasal passage medial to the middle turbinate bone. Surgical resection is used to treat these lesions.<unk> s are often isointense relative to normal brain at MR imaging, which is the imaging modality of choice. High-resolution surface coil MR imaging is often useful in demonstrating the intracranial stalk.
Nasal glioma
Desmoid tumor
Acoustic neuroma
Nasal polyp
Cholesteatoma
Cementoblastoma
Choroid plexus papilloma
Lacrimal gland tumor