Patients come to clinical attention early in life (usually at birth or within the first few months), with a firm subcutaneous nodule at bridge of nose, or as a polypoid mass within the<unk>  cavity, or somewhere along the upper border of the<unk>  bow. If the patient presents with an intranasal mass, there may be obstruction, chronic rhinosinusitis, or<unk>  drainage. If there is a concurrent cerebrospinal fluid (CSF) leak, then an encephalocele is much more likely. This lesion is separated into two types based on the anatomic site of presentation: # Extranasal (60%): Subcutaneous bridge of nose # Intranasal (30%): Superior<unk>  cavity # Mixed (10%): Subcutaneous tissues and<unk>  cavity (larger lesions)
Nasal glial heterotopia
Basilar invagination
Gray matter heterotopia
Dysembryoplastic neuroepithelial tumour
Cranio-lenticulo-sutural dysplasia
Germinal matrix hemorrhage
Cystic hygroma
Choroid plexus papilloma