aneurysmal dilatation of left brachiocephalic #Arteriovenous | Figure 1

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Aneurysmal Dilatation

aneurysmal dilatation of left brachiocephalic #Arteriovenous-fistula (orange arrow) , what does the venogram show (blue arrow) ?

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Digital subtraction venogram demonstrating collateral flow from the left upper extremity. The accessory hemiazygos vein (white arrow) has become a prominent collateral of the left subclavian. Flow is reversed within the left bronchial veins (black arrow), seen receiving blood from the accessory hemiazygos vein and/or left superior intercostal vein. As a result, the left bronchial venous plexus is filled with contrast (yellow-dashed arrow). This plexus drains to the pulmonary veins. This case highlights the life-threatening complications that may result from neglect of an implantable central venous catheter. Preventative measures are to promptly recognize and treat catheter-related thrombosis and to remove unneeded catheters.

Bilateral Cavernous Sinus Thrombosis and thrombosis left superior ophthalmic vein (arrows show normal enhancement right SOV and clot within left SOV) added arrows also show clot in cavernous sinuses.

Cortical AVM # blue arrow - nidus; green arrow - venous drainage.

What anatomic structure is the arrow depicting?

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