[Almost complete regression of cerebral arteriovenous malformation--report of a case (author's transl)].

Spontaneous regression or disappearance of cerebral arteriovenous malformation (AVM) had been rarely reported in the literatures. Regression after carotid ligation or radiation therapy are not spontaneous one, because these treatments may have some influences on morphological changes of AVM by CBF dynamic change or by some radiobiological effects on AVM. The reported case is 57 aged male. He had an episode of sudden onset of left hemiparesis 7 years ago and was treated conservatively at a private doctor. Afterward he enjoyed his life, for 4 years, he consulted our clinic on account of left hemiconvulsion. Right CAG revealed right parietal AVM (3.5 X 4.0 X 5.O) with dilated feeding and draining vessels. Patient denyed operation at that time, but again consulted our clinic on account of severe left hemiconvulsion. Right CAG was performed again, but right parietal AVM was almost not visualized and feeding and draining vessels were diminished in diameter. Inspite of repeated 4 vessel angiographies AVM was remarkably regressed, and also no angiospastic vessels and intracerebral hematoma were absent in these angiographies. Though spontaneous regression of cerebral AVM is rare course, we report the importance of morphological follow up, when cerebral AVM is nondefinitively treated.