Impact of circle of Willis anatomic variations on anterior circulation aneurysm rupture - Oberman, Dan Zimelewicz; Martinez, Jeickson Vergara; Idarraga, Esteban; Yampolsky, Claudio; Akly, Manuel Perez; Besada, Cristina Hilda; Baccanelli, Matteo (Arquivos Brasileiros de Neurocirurgia: Brazilian Neurosurgery, 2018)