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Poster Session I - INTRACRANIAL HEMORRHAGE 02.00 - INTRACRANIAL HEMORRHAGE - 02.02 - SAH, ANEURYSMS AND VASCULAR MALFORMATIONS P151 - ESOC25-1735 LOW GROWTH RISK OF SMALL INCIDENTAL MIDDLE CEREBRAL ARTERY ANEURYSMS Ronil Chandra 1,2 , Fergus Taylor 2 , Seana Gall 3,4 , Leon Lai 1,5 , Christopher Photopoulos 2 , Kenny Li 2 , Shreyas Honavar 2 , Lee-Anne Slater 2,6 , Thanh Phan 4,7 1 Department of Surgery, School of Clinical Sciences at Monash Health, Monash University, Melbourne, Australia, 2 NeuroInterventional Radiology, Monash Medical Centre, Monash Health, Melbourne, Australia, 3 Menzies Institute for Medical Research, University of Tasmania, Hobart, Australia, 4 Department of Medicine, School of Clinical Sciences at Monash Health, Monash University, Melbourne, Australia, 5 Neurosurgery, Monash Medical Centre, Monash Health, Melbourne, Australia, 6 Department of Radiology and Radiological Sciences, School of Clinical Sciences at Monash Health, Monash University, Melbourne, Australia, 7 Neurology, Monash Medical Centre, Monash Health, Melbourne, Australia Background and Aims: The optimal intervals for radiological surveillance of small incidental middle cerebral (MCA) aneurysms remain uncertain, with current guidelines recommending annual or biennial imaging

Medical professionals may recommend periodic reassessment of treatment goals and effectiveness
After one-third of the study participants have been enrolled and completed follow-up, the DSMBs will review the data and make recommendations concerning continuation, modification or termination of the study due to unexpectedly large beneficial effects or serious side effects and can suggest extension of the trial should the primary outcomes occur less often than anticipated