Fig 3.

Responses to question 1 (Is flow diversion an option?). FD was considered an option by at least 7 judges in all cases. The cases in which flow diversion was most frequently judged not to be a viable option were a 20-mm MCA bifurcation aneurysm (A, 15/22 “no” votes) and a 38-mm basilar tip aneurysm (B, 14/22 “no” votes). The cases in which flow diversion was least frequently thought not to be an option, with only 1/22 “no” votes each, were a 22-mm ophthalmic segment aneurysm (C) and a recurrent previously coiled carotid bifurcation aneurysm (D).