[Arterial sinus pericranii. First case report].

Since its first description, SP has been classified and described in the literature as a venous malformation. Although morphologically may resemble a SP, histologically and immunohistochemically it corresponds to an arteriovenous malformation with intracranial arterial connection. It is especially important to know how to diagnose this type of cranial malformations because their long-term evolution will depend on correct management and initial follow-up.