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Fig. 1A —Four cases of lymphedema: two primary and two secondary. 33-year-old man with primary lymphedema. Frontal 3D spoiled gradient-echo high-resolution MR lymphangiography image, obtained 45 minutes after gadodiamide injection, clearly delineates slightly enlarged lymphatic vessels in right lower leg (arrows). Note concomitantly enhanced vein (arrowheads) that shows lower signal intensity.