Progressing stroke. Angiographic aspects.

Progressing strokes were noted in 17 of 256 patients who underwent surgery for atheromatous disease involving the internal carotid artery. This disorder was characterized by an active increase in the neurologic deficit during an 18- to 24-hour period. Although angiographic findings were neither specific for this type of cerebrovascular disease nor uniformly present, the angiography did indicate that not only embolization of the cerebral leptomeningeal conducting vessels but also collaterization through them was a pertinent mechanism.