2): A Well-defined lobulated heterogenous lesion with hyperdense and hypodense components in the anterior portion of right nasal cavity, with hypodense component appears to continue intracranially through a small defect of 1mm between crista galli and frontal crest (Fonticulus nasofrontalis)--findings may suggest glial heterotopias (Nasal glioma).
They all arise from a lack of regression of a dural diverticulum in the prenasal space that extends through the embryologic foramen cecum or the fonticulus frontalis.
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