Sinus pericranii (SP) is a cranial venous anomaly in which there is an abnormal communication between intracranial dural sinuses and extracranial venous structures, usually via an emissary transosseous vein.

Differential diagnosis:

• Atretic cephalocele
• dural fistula or arteriovenous malformation
• subepicranial varix (dilated scalp venous sac without communication with intracranial dural sinuses)
• Dermoid or epidermoid sinus
• Sebaceous cyst
• Cephalhematoma
• Infantile hemangioma

Associations

• systemic angiomas
• craniosynostosis