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Fig. 5A. —30-year-old man with primary lower extremity lymphedema and Prader-Willi syndrome. Lymphoscintigram obtained 45 min after injection of radionuclide shows multiple large and tortuous lymphatic channels with multiple additional lymphatic vessels in thighs and calves. Increased numbers of bilateral ilioinguinal lymph nodes (small arrows) as well as megalymphatics (large arrows) in right calf both medially and laterally are visible.