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In the posterior fossa, there are tangles of blood vessels seen close to the tentorium cerebelli at the midline with secondary enlargement of the torcular herophili as well as both transverse sinuses and the distal part of the posterior sagittal sinus. The vein of Galen and straight sinus are not dilated. There is dilated meningeal arteries from external carotid and vertebral arteries bilaterally extending to the site of the dilated vessels in the posterior fossa. Findings are impressive of dural AV fistula