To understand the MR imaging appearances of arterio-venous malformations in the brain and spine. To learn the possible complications of arterio-venous malformations. To observe the MR imaging appearance of treated arterio-venous malformations.

Overview Arterio-venous malformations represent anomalous connections between arteries and veins through a disorganised tangle of small vessels called nidus and are a circulation wherein blood bypasses the capillaries and goes directly from arteries to veins. Clinical features(1) Usually arterio-venous malformations are asymptomatic; however they may present with headache, numbness, weakness etc. depending on their location and extent of bleeding. Inpatients who present without haemorrhage, clinical presentations include: Seizures Headache Muscle weakness or numbness Depending on the location of the AVMs, patients can have more serious...

Summary. MRI protocol included T1, T2, FLAIR, DWI and SWI sequences for all 11 patients out of which post contrast T1 weighted images were available for 7 patients. 10 of these patients presented with cerebral lesions and one of them was imaged post embolization. 1 patient presented with a spinal arterio-venous malformation. Flow voids, feeder arteries, large draining veins, tangle of blood vessels, vascular loops and mass effect were some of the major findings that were observed. Other findings included signal changes and blooming artifacts...

AV malformations can occur in any part of the body and two of the main locations are described in this educational exhibit. Usually arterio-venous malformations are diagnosed on MRI but contrast enhanced CT and angiography may also help in making the diagnosis. It is important to diagnose these arterio-venous malformations and their complications to help the clinicians make correct decisions for their management.

Dr. Vendoti Nitheesha Reddy Final year Resident Department of Radio-diagnosis and Imaging Ramaiah Medical College and Hospitals Bangalore - 560054. Email: [email protected] Dr. Pannag Desai Senior Resident Department of Radio-diagnosis and Imaging Ramaiah Medical College and Hospitals Bangalore - 560054. Email: [email protected] Dr. Ashok kumar A. Professor and Head of Department Department of Radio-diagnosis and Imaging Ramaiah Medical College and Hospitals Bangalore - 560054. Email: [email protected]

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