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Figure 2. 57-year-old woman with arteriovenous fistula in the left parotid gland. (a) Transverse grey-scale ultrasound of left parotid gland shows a well-circumscribed cystic lesion with internal septation involving both superficial and deep lobes (arrow). (b) Transverse grey-scale ultrasound of the left parotid region shows dilated and tortuous vascular channels in the vicinity of the lesion (arrows). (c) Axial fat-suppressed spin-echo T1 weighted MRI (520/13/4) shows conglomerate serpiginous signal void involving superficial and deep lobe of left parotid gland. (d) Digital subtraction left external carotid angiogram in anteroposterior projection. (e) Digital subtraction left external carotid angiogram in lateral projection. Numerous tortuous dilated veins in the left parotid region are shown (d, e) supplied by a hypertrophied feeder from external carotid artery (arrow) and drain into left external jugular vein (arrowhead). (f) Post-embolisation digital subtraction left external carotid angiogram in lateral projection shows complete obliteration of the arteriovenous fistula.
