J Korean Neurosurg Soc.  2003 Jul;34(1):57-60.

Medial Trunk Aneurysm of the Distal Posterior Inferior Cerebellar Artery in the Fourth Ventricle: Case Report

• Ahn JY
• Chung YS
• Kim OJ
• Choi SW

Abstract

We present a case of a ruptured aneurysm of the medial trunk of the right posterior inferior cerebellar artery(PICA) in the fourth ventricle. A 52-year-old man presented with sudden onset of headache, followed by an abrupt decline in consciousness. Angiographic studies revealed that the aneurysm arose from the medial trunk of the right PICA, distal to the choroidal point and associated with the stenosis of the basilar artery and the hypoplasia of the right anterior inferior cerebellar artery and superior cerebellar artery. The patient underwent a midline suboccipital craniotomy and aneurysmectomy after clipping of the parent artery. A postoperative angiogram confirmed complete obliteration of the aneurysm, but demonstrated occlusion of the vermian branch of the right PICA. The pathogenesis of this lesion could be due to hemodynamic stress.

Keyword

Fourth ventricle; Intracranial aneurysm; Posterior inferior cerebellar artery

MeSH Terms

Aneurysm*
Aneurysm, Ruptured
Arteries*
Basilar Artery
Choroid
Consciousness
Constriction, Pathologic
Craniotomy
Fourth Ventricle*
Headache
Hemodynamics
Humans
Intracranial Aneurysm
Middle Aged
Parents
Pica