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Figure 4


Fig. 3A —65-year-old woman with T2 N0 rectal carcinoma. Both scans show submucosa is penetrated by tumor and tumor involvement of muscularis propria. Arrows mark border of submucosa at margin of tumor. Endorectal sonogram obtained with axial rotating probe shows eccentric mass (M) between 11:30- and 4-o'clock positions. Mass obliterates submucosa and bulges deep border of wall but does not show extension into perirectal fat.