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Fig. 2B. —Popliteal lymph node in rabbit. Sonograms of popliteal lymph node obtained before (A) and after (B) second 30-sec massage after administration of 1 mL of contrast material into right footpad. Note that hypoechoic lymph node (arrowheads, A) seen before contrast enhancement is markedly enhanced (arrow, B) after contrast agent is administered.