ĐẶC ĐIỂM HÌNH ẢNH VÀ GIÁ TRỊ CỦA CỘNG HƯỞNG TỪ TRONG CHẨN ĐOÁN DỊ DẠNG ĐỘNG TĨNH MẠCH NÃO

Abstract

Background: Cerebral arteriovenous malformations are characterised by direct shunts between the arterial and venous systems through a nidus without an intervening capillary network, and may cause intracranial haemorrhage with high rates of neurological sequelae and mortality. Magnetic resonance imaging allows detection and characterisation of the nidus. Objectives: To describe the imaging characteristics and evaluate the diagnostic value of magnetic resonance imaging in cerebral arteriovenous malformations. Materials and methods: A prospective crosssectional descriptive study of 43 patients with suspected cerebral arteriovenous malformation who underwent non-contrast brain magnetic resonance imaging and digital subtraction angiography at Can Tho Central General Hospital and Can Tho Stroke International Services from June 2024 to January 2026. Results: Digital subtraction angiography confirmed cerebral arteriovenous malformation in 37 of 43 patients, of which magnetic resonance imaging detected 36. Among the 36 niduses detected on magnetic resonance imaging: supratentorial location accounted for 88.9% and eloquent-area involvement for 38.9%; nidus size < 3 cm accounted for 52.8%; exclusively superficial venous drainage accounted for 75.0%; and Spetzler-Martin grade I was the most frequent, at 38.9%. In the diagnosis of cerebral arteriovenous malformation, magnetic resonance imaging achieved a sensitivity, specificity and accuracy of 97.3%, 100% and 97.7%, respectively; accuracy in identifying draining veins and feeding arteries were 86.1% and 83.3%, respectively. Conclusion: Magnetic resonance imaging demonstrates high diagnostic value for cerebral arteriovenous malformations.