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Fig. 14D. —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 3.5 hr after injection of radionuclide shows diffuse bilateral dermal backflow and extravasation (small arrows) from lymphatic channels. Abnormal structures (large arrows) in abdomen and pelvis are accentuated and are also seen in thorax (open arrow).