“…[23][24][25] Asymptomatic subarachnoid hemorrhage and angiographically occult vessel perforations can be detected quite frequently in follow-up imaging after mechanical thrombectomy in Table 2: List of types, manufacturers, and number of maneuvers for mechanical thrombectomy up to 16.1% of patients. 21,26 Angiographically apparent vessel perforations and symptomatic subarachnoid hemorrhage occur in 0.6%-2.9% of patients after mechanical thrombectomy, 1,4,5,27,28 and reports addressing the immediate treatment of vessel perforation after mechanical thrombectomy have been published. 29 In our case, despite stent deployment without any problems and after a previous retrieval maneuver that had already recanalized the middle cerebral artery main branch, symptomatic subarachnoid hemorrhage occurred following a second retrieval maneuver, causing an MCA perforation (distal M2 segment).…”