title: Aneurysm of azygos anterior cerebral artery associated with falcine meningioma: Case Report and review of the literature.
abstract: BACKGROUND
  The azygos anterior cerebral artery (ACA) is an uncommon intracranial vascular anomaly of the circle of Willis. Identification of aneurysm from azygos ACA with anterior falcine meningioma is an extremely rare association. The aim of the present study is to report the case of an adult female with a ruptured aneurysm from azygos ACA in association with an anterior falcine meningioma.
  
  
  METHODS
  A 65-year-old female was admitted in the Emergency Department reporting sudden onset of severe headache. Computed tomography (CT) revealed an intracerebral hematoma and an expansive calcified lesion. AngioCT showed the presence of a large aneurysm in the distal portion of the azygos ACA. During the surgical procedure, it was possible to visualize the aneurysm in contact with an expansive lesion arising from the anterior third of the falx. Microsurgical clipping of the aneurysm was performed uneventfully and partial resection of the tumor was done. Histopathological analysis showed a fibrous meningioma. The patient was discharged home on the seventh postoperative day in good clinical conditions.
  
  
  CONCLUSIONS
  The association of aneurysm from azygos ACA and falcine meningioma is an extremely rare event and must be remembered when expansive masses are present in the vicinity of vascular lesions.
authors.affiliation: Department of Neurological Sciences, Division of Neurosurgery, Hospital de Base, Faculdade de Medicina de São José do Rio Preto (FAMERP/SP), São Paulo, Brazil.
authors.forename: Lucas C
authors.initials: LC
authors.lastname: Meguins
authors.affiliation: Department of Neurological Sciences, Division of Neurosurgery, Hospital de Base, Faculdade de Medicina de São José do Rio Preto (FAMERP/SP), São Paulo, Brazil.
authors.forename: Raquel C T
authors.initials: RC
authors.lastname: Hidalgo
authors.affiliation: Department of Neurological Sciences, Division of Neurosurgery, Hospital de Base, Faculdade de Medicina de São José do Rio Preto (FAMERP/SP), São Paulo, Brazil.
authors.forename: Antônio R
authors.initials: AR
authors.lastname: Spotti
authors.affiliation: Department of Neurological Sciences, Division of Neurosurgery, Hospital de Base, Faculdade de Medicina de São José do Rio Preto (FAMERP/SP), São Paulo, Brazil.
authors.forename: Dionei F
authors.initials: DF
authors.lastname: de Morais
keywords: Aneurysm; azygos anterior cerebral artery; falcine meningioma