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Spontaneous regression of cerebral arteriovenous malformation (AVM) is a rare phenomenon, but its occurrence is an important consideration in treatment planning. A 58-year-old male was found to have a high-flow AVM of Spetzler-Martin Grade III. Before his scheduled treatment, the AVM ruptured with a large parenchymal hemorrhage. Following emergency decompressive surgery, a targeted embolization procedure was performed to obliterate the ruptured weak point and to reduce the shunting flow. The residual AVM became a malformation harboring angio-architectural factors favoring spontaneous obliteration. Together with other favorable clinical factors, including prior parenchymal hemorrhage and neurosurgical intervention, the residual AVM spontaneously regressed in 2 months. This case highlighted a possible treatment strategy in that, for a ruptured AVM in which definite treatment is not possible, an alternative is to treat the AVM into a situation in which as many favorable factors as possible for spontaneous AVM regression are present.

Rendering a ruptured arteriovenous malformation more susceptible to spontaneous obliteration as a possible treatment strategy for cerebral AVM