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Fig. 5B. —64-year-old man with stage pT3 pN1 rectal carcinoma. Although lesion is located high in rectum, transrectal sonogram shows it to be hypoechogenic, between 1- and 4-o'clock positions, and infiltrating into perirectal fat (arrowheads). Note malignant lymph node (arrows) in perirectal fat tissue at 5-o'clock position.