1Tree-dimension rotational angiography (3DRA) of the left ICA on day 0 showing an internal cerebral artery (ICA) anterior wall aneurysm (a) and not aneurysm in the posterior communicating artery (P-com A) (b). Left ICA angiography showed that the ICA anterior wall aneurysm had a tendency for thrombosis and no other de novo aneurysm could be seen. The follow-up angiography on day 7 revealed the morphological change of the ICA anterior wall aneurysm, implying SAH was caused by the aneurysm (Fig. Left ICA angiography displayed a ruptured de novo aneurysm at the proximal side of P-com A, whose origin of which was covered by FRED, and a thrombosis was observed at the ruptured anterior wall aneurysm (Fig. [Extracted from the article]