Nasal glioma (nasal brain heterotopia)
Congenital nasal lesion. MRI requested to role out intra-cranial continuation.
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Left sided extranasal lesion with signal intensity similar to that of the intra-cranial brain is noted with no evidence of intra-cranial continuation.
A nasal glioma usually has no connection to the intracranial brain. These lesions unlike intracranial gliomas, contain non-neoplastic glial tissue. For this reason, the term nasal glioma is not accurate; nasal brain heterotopia or nasally trapped brain might be a better term.
Nasal gliomas are generally disconnected from the brain and grow very little or none at all.
Occasionally (1%–15%), they remain connected to the brain via a thin stalk, and their growth may reflect that of intracranial structures.
Nasal gliomas have intermediate signal intensity on T1-weighted images, may show some contrast enhancement, and have high signal intensity on T2-weighted images as a result of gliosis.
- Radiographics : Congenital and Acquired Lesions of the Nasal Septum: A Practical Guide for Differential Diagnosis. María P. Valencia, MD, and Mauricio Castillo, MD, et al