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Large vascular lesion in left posterior fossa passing through the diploe of the left occipital bone (ROI) to enter the left transverse sinus. Note arterialized blood in the sinus (high signal on the MRA segmentations) and enlarged feeding arteries ie middle meningeal at foramen spinosum (arrow), superficial temporal (arrow), posterior auricular (arrow) and occipital (arrow). These are all branches of the external (not internal) carotid.