抄録
Ruptured aneurysms of the anterior inferior cerebellar artery (AICA) are rare, occuring in less than 1% of aneurysms of the posterior circulation. The patient we report was a 66-year-old woman who complained of sudden severe headaches. She consulted our hospital 10 days after the first headache. At that time, she had no neurological abnormalities apart from the headaches and a CT scan did not indicate subarachnoid hemorrhage (SAH). However, tests revealed that the cerebrospinal fluid of the patient was xanthochromic so she was diagnosed as SAH. Subsequent cerebral angiography (CAG) did not reveal any ruptured aneurysms. After 14 days, CAG was re-examined and a ruptured saccular aneurysm at the distal portion of the meatal loop of the AICA was detected.
Forty days after onset, neck clipping of the aneurysm via the right lateral suboccipital craniectomy was performed. The clipping was successful and she was discharged without any deficits. This case is consistent with the findings of reported cases in that the patient had no neurological abnormalities of cranial nerves VII VIII and the aneurysm could not be detected on the initial CAG.
