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Quantitative DSA of cases of Cognard type I (A), Cognard type IIa (B), and Cognard type IIa+b (C). Severe sinus stenosis is more commonly encountered in more aggressive DAVF types. The TFT (TTP of the internal jugular vein) was largest in type IIa+b (green), followed by types IIa (yellow-green) and I (yellow). Progressive shortening of the TTP in the superior sagittal sinuses in type IIa and type IIa+b is also depicted.
