Brachiocephalic vein compression caused by a mediastinal cystic tumor presenting with rapidly progressive upper limb swelling and pain in a patient on hemodialysis with a newly created arteriovenous graft.

A 61-year-old man was hospitalized for creating vascular access for maintenance hemodialysis. Chronic interstitial nephritis was the cause of his end-stage kidney disease. An arteriovenous graft (AVG) was selected because superficial veins in his bilateral upper limbs were not suitable for arteriovenous fistula (AVF).