The nature of this malformation remains unclear. Congenital, spontaneous, and acquired origins are accepted. The hypothesis of a spontaneous origin in the current case of SP is supported by no evidence of associated anomalies, such as cerebral aneurysmal venous malformations, systemic angiomas, venous angioma dural malformation, internal cerebral vein aneurysm, and cavernous hemangiomas.
Sinus pericranii
Cortical homunculus
Cave of septum pellucidum
Anterior funiculus
Tapetum lucidum
Otic vesicle
Stenopaeic slit
Frenulum breve