title: Mixed aneurysm: A new proposed nomenclature for a rare condition.
abstract: BACKGROUND
  Mixed intracranial aneurysms are vascular lesions appearing in the ruptured saccular aneurysms whose blood is contained by perivascular tissues forming another cavity called pseudoaneurysm. All cases until now have been reported in the literature with subarachnoid hemorrhage.
  
  
  METHODS
  A 65-year-old woman presented with multiple brain aneurysms with no history of subarachnoid hemorrhage. Endovascular treatment was chosen for left-sided aneurysms [lateral carotid wall (LCW) and posterior communicating (PCom)]. After the embolization of the LCW aneurysm, the patient developed a left third nerve palsy. A head computed tomography scan was immediately performed which did not show any SAH. The control angiography demonstrated PCom aneurysm with intraaneurysmal contrast retention even in the venous phase, along with modification of the aneurismal sac format, leading to diagnoses of mixed aneurysm. The PCom aneurysm was successfully coiled and an operation was performed to clip the right side aneurysms. The patient was discharged after 10 postoperative days.
  
  
  CONCLUSIONS
  Mixed intracranial aneurysm has special radiological characteristics that should be promptly recognized to offer the best treatment.
authors.affiliation: Instituto de Neurologia e Neurocirurgia de Passo Fundo, Hospital São Vicente de Paulo, Passo Fundo, RS, Brazil.
authors.forename: Cassiano U
authors.initials: CU
authors.lastname: Crusius
authors.affiliation: Department of Surgery, Post Graduation Section in Surgery, Universidade Federal do Rio Grande do Sul (UFGRS); Department of Neuroncological Surgery, Hospital Alemão Oswaldo Cruz, São Paulo, SP, Brazil.
authors.forename: Paulo Henrique P
authors.initials: PH
authors.lastname: de Aguiar
authors.affiliation: Instituto de Neurologia e Neurocirurgia de Passo Fundo, Hospital São Vicente de Paulo, Passo Fundo, RS, Brazil; Universidade de Passo Fundo (UPF), Passo Fundo, RS, Brazil.
authors.forename: Marcelo U
authors.initials: MU
authors.lastname: Crusius
keywords: Brain aneurysm; dissection; endovascular