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Fig. 6 —Schematic shows T component of TNM staging of rectal cancer.
Tumors are red and exhibit progressively deeper invasion beginning at
10-o'clock position, where T superficial noninvasive lesion involves only
superficial layers of intestinal wall. At 7-o'clock position, T1 lesion
invades submucosa (yellow). At 5-o'clock position, T2 lesion invades
muscularis propria (blue). At 2-o'clock position, T3 lesion exhibits
full-thickness invasion through layers of rectal wall with invasion of
surrounding perirectal fat. In directly anterior aspect (12-o'clock position),
T4 lesion exhibits invasion of prostate gland.
