-The purpose of this study was to correlate the angioarchitecture of brain arteriovenous malformations (AVM) with their clinical presentation. A total of 170 patients with AVM 78 males and 92 females, were studied. Univariate and multivariate analyses were conducted in order to test the associations between morphological features and clinical presentation. The most frequent clinical presentations at diagnosis were hemorrhage in 89 (52%) patients, headache in 79 (46%), focal neurological deficit in 54 (32%), and seizure in 52 (31%). According to the Spetzler-Martin classification, grade I was found in 15 patients, II in 49, III in 55, IV in 41, and grade V in 10 patients. AVM with small nidus size, single feeding artery and single draining vein were associated with hemorrhage. Hemorrhage was positively associated with Spetzler-Martin grade I and negatively with grade V. The association between seizure and large nidus size was positive, however negative with small nidus size.Key wordS: brain arteriovenous malformations, angioarchitectural features, clinical presentation. Angioarquitetura e apresentação clínica de malformações arteriovenosas encefálicasResumo -o objetivo deste estudo foi correlacionar a angioarquitetura de malformações arteriovenosas encefálicas (MAV) com sua apresentação clínica. Foram estudados 170 pacientes portadores de MAV, sendo 78 do sexo feminino e 92 do masculino. Análises univariada e multivariada foram efetuadas para testar associações entre características morfológicas e quadro clínico. As principais formas de apresentação clínica no momento do diagnóstico incluíram hemorragia em 89 (52%) pacientes, cefaléia em 79 (46%), déficit focal em 54 (32%) e convulsão em 52 (31%). de acordo com a classificação de Spetzler e Martin, 15 pacientes tinham MAV grau I, 49 grau II, 55 grau III, 41 grau IV, e 10 grau V. MAV com nidus de tamanho pequeno, aferência e eferência únicas foram associados à hemorragia. Hemorragia foi positivamente associada com grau I e negativamente com grau V. A associação entre convulsão e nidus de tamanho grande foi positiva, porém negativa com nidus de tamanho pequeno.PAlAVrAS-cHAVe: malformações arteriovenosas encefálicas, angioarquitetura, apresentação clínica. of AVMs remains incompletely elucidated and its treatment is still a challenge to neurosurgeons. The purpose of this study was to morphologically characterize a series of brain arteriovenous malformations, trying to establish a correlation with their clinical presentation. METHODone hundred and seventy patients with brain AVMs, admitted at the Vascular and endovascular Neurosurgery Unit of Hospital de Base at São José do rio Preto, São Paulo, Brazil, were studied between January, 2001, and January, 2007. Seventy-eight (46%) were male and 92 (54%) female, and age ranged from 1 to 77 years (34.1±15 years) at presentation.This study was approved by the research ethics committee of the São José do rio Preto Medical School (FAMerP).other types of vascular malformations such as dural fistula, carotid-cavernous ...

The purpose of this study was to correlate the morphology of giant intracranial aneurysms (GIA) with their clinical presentation. Eighty patients with GIA, 14 males and 66 females, were studied. Univariate and multivariate analyses were made to test the associations between morphological and clinical features. The main locations of the unruptured GIA included the carotid cavernous segment, and for the ruptured GIA, the most frequent were the carotid supraclinoid and middle cerebral arteries. There was a significant association among communicating arteries (CA) of "bad" quality and presence of thrombus and calcification (TC). The risk of rupture is 8 times higher in patients with CA of "bad" quality and 11 times higher in patients without TC. GIA are more frequent in the cavernous segment. There is a high rupture risk in the middle cerebral artery. CA of "bad" quality are associated with TC. The rupture risk is significantly higher in patients without TC.

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ResumoAneurismas intracranianos gigantes são definidos como aqueles em que o seu maior diâmetro ultrapassa 25 mm, sendo considerados entidade clínico-patológica que difere dos aneurismas de diâmetro menor quanto a incidência de ruptura, apresentação clínica e dificuldade de terapêutica. O tratamento do aneurisma gigante pode ser conservador, endovascular ou neurocirúrgico, e essa decisão depende de fatores como localização anatômica e características do aneurisma, condição médica, idade do doente, habilidades cirúrgicas e possibilidade de tratamento endovascular ou bypass. Apesar de o avanço no conhecimento da patogenia, hemodinâmica, morfologia, de a melhoria nos métodos de diagnóstico por imagem e de o desenvolvimento de técnicas endovasculares e microcirúrgicas terem possibilitado melhor resultado de tratamento, aneurismas gigantes apresentam prognóstico ruim e continuam desafiando os limites de técnicas neurocirúrgicas.

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Keywords► cerebrovascular disorders ► intracranial arteriovenous malformations ► arteriovenous fistula ► intracranial aneurysm ► postoperative care ► intracranial hemorrhages AbstractDural arteriovenous fistulas (DAVFs) are pathologic dural shunts characterized by meningeal arterial supply, absence of nidus and drainage to dural venous sinuses or cortical veins. They are usually acquired lesions associated with specific disease and inflammatory processes, including craniotomy. We report a case of postoperative DAVF in a 59 year-old male presenting with a ruptured distal right anterior cerebral artery aneurysm. After an uneventful microsurgery for clipping, meningitis occurred on the ninth day, and was successfully treated. The one-year control angiogram showed a left occipital DAVF. The relevant literature on the occurrence of DAVFs is also presented.