Atretic parietal cephalocele is a subgaleal lesion that consists of dura, fibrous tissue and dysplastic brain tissue.

Radiographic findings include:

• Subgaleal soft tissue mass with intracranial extension via sharply demarcated calvarial defect (cranium bifidum)
• CSF tract and vertical falcine vein point to the subcutaneous scalp mass
• vertically oriented primitive falcine vein
• fibrous stalk connecting the cephalocele
• focal fenestration of superior sagittal sinus at the atretic parietal cephalocele
• prominence of the superior cerebellar cistern and suprapineal recess
• superior peaking of the posterior tentorium
• spinning top configuration of the tentorial incisura

Differential diagnosis :

• sinus pericranii
• dermoid or epidermoid cyst
• cephalohematoma
• sebaceous cyst
• vascular lesions (hemangioma)