Surgically verified variations in the A1 segment of the anterior cerebral artery. Report of two cases

J Neurosurg. 1991 Dec;75(6):950-3. doi: 10.3171/jns.1991.75.6.0950.


Two patients with rare variations of the A1 segment of the anterior cerebral artery are presented. One patient had a perforation of the optic tract by an abnormal course of the A1 segment, and the other harbored an aneurysm of the A1 segment running below the optic nerve. The authors present a summary of A1 segment variations described in the literature.

Publication types

  • Case Reports
  • Review

MeSH terms

  • Adult
  • Brain Neoplasms / surgery
  • Cerebral Arteries / anatomy & histology*
  • Cerebral Arteries / surgery*
  • Craniopharyngioma / surgery
  • Humans
  • Intracranial Aneurysm / complications
  • Intracranial Aneurysm / surgery
  • Male
  • Subarachnoid Hemorrhage / etiology
  • Subarachnoid Hemorrhage / surgery