[A case presentation in which cerebral aneurysm disappeared then recurred documented by cerebral angiography (author's transl)].

A 50-year-old man was admitted to this hospital with an onset one day previously of headache and impaired consciousness. Cerebral angiography performed on the date of admission revealed a middle cerebral artery aneurysm, measuring approximately 7 X 8 X 9 mm. The patient was begun on t-AMCHA 6 g/day, hypotensive agents and anticonvulsants. On the second day after administration, the patient exhibited a temperature of 38 degree C which continued for 3 weeks and was of unknown ethiology. Repeat cerebral angiography was performed two weeks later, and examination of the right carotid artery revealed that the aneurysm had disappeared. Also noted was a slight vasospasm on the internal carotid artery and the peripheral middle cerebral artery from an aneurysm. One week later, another examination confirmed that the aneurysm had indeed disappeared and the vasospasm was decreased. The fourth cerebral angiography was done 32 days after admission and showed definite recurrence of the aneurysm. Surgery and clipping of the aneurysm were done the following day. The postoperative course was uneventful and the patient was discharged from the hospital without neurologic abnormalities. This is the third reported case of the recurrence of an aneurysm that had once disappeared from cerebral angiography. This case may represent an episode of "spontaneous thrombosis" or "spontaneous cure or healing."