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Fig. 4C. Chronic deep venous thrombosis in 74-year-old man undergoing
dialysis because of chronic renal failure. Transverse sonogram of left common
femoral vein shows intraluminal echogenic material without shadowing
(arrow). Vein was not compressible. It is known that thrombus
echogenicity is not an accurate criterion for determining age of venous
thrombosis.