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Fig. 14C. —44-year-old man who had bilateral lower extremity edema below the waist for 1 year without history of surgery or trauma. Abdominal and pelvic lymphadenopathy identified on CT was biopsied and was negative for malignancy. Cause of findings is unknown. Lymphoscintigram obtained 45 min after injection of radionuclide shows lymphocele or megalymphatic vessel (large arrow) in right calf, diffuse bilateral dermal backflow (small arrows), and early filling (open arrow) of abnormal structures in abdomen and pelvis, consistent with small lymph nodes and abnormal lymph vessels in mesentery.