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Fig. 3D —Chronic subtotal occlusion of superior vena cava (SVC) and marked azygous collateralization shown on MR angiography in 16-year-old girl with sickle cell anemia and history of multiple central venous catheters. See also Figure S3, AVI images, at www.ajronline.org. Venous phase image shows patency of left internal jugular, subclavian, and brachiocephalic veins and near occlusion of SVC. Note nonopacification of right central veins. High-spatial-resolution images (not shown) showed occlusion of right subclavian, internal jugular, and brachiocephalic veins.