• Guilherme Brasileiro de Aguiar, Rafael Gomes Dos Santos, PaivaAline Lariessy CamposALCMD. Neurosurgery Resident, Faculdade de Ciências Médicas da Santa Casa de São Paulo (FMSCSP), São Paulo (SP), Brazil., João Miguel de Almeida Silva, Rafael Carlos da Silva, and VeigaJosé Carlos EstevesJCEMD, PhD. Full Professor and Head of Discipline of Neurosurgery, Faculdade de Ciências Médicas da Santa Casa de São Paulo (FMSCSP), São Paulo (SP), Brazil..
• MD, MSc. Attending Neurosurgeon, Faculdade de Ciências Médicas da Santa Casa de São Paulo (FMSCSP), São Paulo (SP), Brazil.
• Sao Paulo Med J. 2019 Jan 1; 137 (1): 929592-95.

ContextPresence of an arachnoid cyst and a non-ruptured intracystic brain aneurysm is extremely rare. The aim of this paper was to describe a case of a patient with an arachnoid cyst and a non-ruptured aneurysm inside it. Clinical, surgical and radiological data were analyzed and the literature was reviewed.Case ReportA patient complained of chronic headache. She was diagnosed as having a temporal arachnoid cyst and a non-ruptured middle cerebral artery aneurysm inside it. Surgery was performed to clip the aneurysm and fenestrate the cyst.ConclusionsThis report raises awareness about the importance of intracranial vascular investigation in patients with arachnoid cysts and brain hemorrhage.

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