Atretic cephalocele consists of:

• subgaleal mass with intracranial extension.
• vertical primitive falcine vein and fibrous tract point to the subcutaneous scalp mass.
• focal fenestration of the superior sagittal sinus at the AC.

Differential diagnosis:

• sinus pericranii
• dermoid or epidermoid sinus
• sebaceous cyst
• cephalohematoma
• infantile hemangioma