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[An autopsy case of a persistent primitive trigeminal artery aneurysm]
1Department of Neurosurgery, Sado General Hospital, Niigata, Japan.
No Shinkei Geka. Neurological Surgery
|February 1, 1988
Summary
A rare case of a persistent primitive trigeminal artery (PPTA) aneurysm causing subarachnoid hemorrhage is presented. Pathological findings revealed arteriosclerosis, not dysplasia, as a potential factor in aneurysm formation.
Area of Science:
- Neurology
- Vascular Surgery
- Pathology
Background:
- Persistent primitive trigeminal artery (PPTA) is a rare vascular variant.
- Aneurysms on the PPTA are exceptionally uncommon, with few reported cases.
Observation:
- A 75-year-old woman presented with subarachnoid hemorrhage due to a saccular aneurysm on the right PPTA.
- The aneurysm was located on the trunk of the PPTA, originating from the internal carotid artery and joining the basilar artery.
- The patient succumbed to rebleeding 30 days after admission.
Findings:
- Histopathological examination revealed severe arteriosclerosis in the proximal PPTA segment.
- Crucially, no evidence of developmental anomaly or dysplasia in the PPTA wall was found.
- This contrasts with previous speculation that PPTA wall dysplasia contributes to aneurysm formation.
Implications:
- This case highlights arteriosclerosis as a potential etiological factor for PPTA aneurysms.
- Further pathological studies are needed to fully understand the pathogenesis of PPTA aneurysms.
- The findings challenge existing theories and emphasize the importance of detailed pathological examination.