The 4-week follow-up MRI shows persistent haemosiderin capping on SWI. T1W hyperintensity in the saccular aneurysm related to blood products, but no real flow sign in TOF angiography where the saccular signal is due instead to T1 shine through effect.
Further there is subacute ischaemia of the pons with no diffusion restriction. The patient was asymptomatic for this, likely ischaemia related to spontaneous occlusion of the basilar perforator aneurysm.
Direct angiogram is still required to assess aneurysm occlusion or persistence.