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Related Experiment Video

Updated: Aug 5, 2025

Optimization of the Longa Middle Cerebral Artery Occlusion Method for Complete Reperfusion
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Extremely long posterior cerebral artery P1 segment.

Hideki Endo1, Hidetoshi Ono2, Bunsho Asayama3

  • 1Department of Neurosurgery, Nakamura Memorial Hospital, South 1, West 14, Chuo-Ku, Sapporo, Hokkaido, 060-8570, Japan. endo@med.nmh.or.jp.

Surgical and Radiologic Anatomy : SRA
|March 29, 2023
PubMed
Summary

An extremely long P1 segment of the posterior cerebral artery (PCA) was identified in a 96-year-old woman. This rare anatomical variation was diagnosed using 1.5-T magnetic resonance angiography (MRA).

Keywords:
Anatomical variationMagnetic resonance angiographyP1 segmentPosterior cerebral arteryPosterior communicating artery

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Area of Science:

  • Neuroimaging
  • Vascular Anatomy
  • Neurology

Background:

  • Anatomical variations of the posterior cerebral artery (PCA) are uncommon, with aplasia and hypoplasia being the most frequently reported.
  • Reports detailing an exceptionally long P1 segment of the PCA are scarce in existing literature.

Observation:

  • A 96-year-old female patient presented with impaired consciousness.
  • Magnetic resonance angiography (MRA) revealed an unusually elongated P1 segment of the left posterior cerebral artery (PCA), measuring 27.3 mm.
  • An incidental finding of basilar artery fenestration was also noted.

Findings:

  • The study documents a rare case of an extremely long P1 segment of the left PCA.
  • The posterior communicating artery (PCoA) was of normal length (20.9 mm).
  • The left anterior choroidal artery originated distal to the PCoA branching point.

Implications:

  • Accurate identification of rare vascular anatomical variations is crucial for clinical diagnosis and treatment planning.
  • 1.5-Tesla (1.5-T) magnetic resonance angiography (MRA) is effective in visualizing and confirming such anatomical anomalies.
  • This case highlights the importance of thorough imaging assessment in detecting subtle yet significant cerebrovascular variations.