Fenestrated P1 segment of posterior cerebral artery, partly duplicated posterior communicating artery.
Surg Radiol Anat 2023;
45:761-763. [PMID:
37069448 DOI:
10.1007/s00276-023-03145-4]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 04/09/2023] [Indexed: 04/19/2023]
Abstract
PURPOSE
Anatomic variations at the junction of primitive internal carotid and basilar arteries are exceedingly rare. We aimed at reporting such rare variants involving the posterior communicating artery (PComA) and the P1 segment of posterior cerebral artery (PCA).
METHODS
The circle of Willis was dissected in an adult cadaver after removal of the cranial vault and cerebral hemispheres.
RESULTS
The basilar end was rotated axially to the right. The P1 segment of the right PCA was fenestrated and occupied the interpeduncular fossa. The right PComA passed over the oculomotor nerve to join the anterior arm of the P1 fenestration. On the opposite side, the PComA coursed supero-medially to the oculomotor nerve and it had a partly duplicated posterior end, with two arms, medial, larger, and lateral, thinner, inserting successively into the left PCA.
CONCLUSION
Extremely rare anatomic variations of the circle of Willis should not be ignored when endovascular or microneurosurgical specific approaches are intended.
Collapse