cm●peritonealportionandpelvisportion●mesorectumMesorectum全直肠系膜切除(TME)TotalMesorectumExcisionABOUTRECTUM*●commontumoringastrointe-stinaltract●occurmostlyat41~65yearsold●coloncancerseemsmoreandmoreinrecent20years●proliferation—adenoma--carcinoma,about10~15yearsINTRODUCTION*PATHOLOGY●Masstype(隆起型)多见于升结肠、盲肠,肠腔内生长,转移发生较晚●Invasivetype(浸润型)多见于降结肠,肠壁内生长,易引起狭窄及梗阻●Ulcerationtype(溃疡型)最常见类型,向肠壁深处生长,形成溃疡,容易发生出血、感染或者穿孔*MASSTYPE*INVASIVETYPE*ULCERATIVETYPE*LASSIFICATION腺癌(Adenocarcinoma)●管状腺癌(tubularadenocarcinoma)●乳头状腺癌(papillaryadenocarcinoma)●粘液腺癌(mucinousadenocarcinoma)●印戒细胞癌(-ringcelladenocarcinoma)腺鳞癌(Adenosquamouscarcinoma)通常见于低位直肠癌或者肛管癌未分化癌(undifferentiatedcarcinoma)*NormalepitheliumMicro-adenomaEarly-stageadenomaMiddle-efromthecancerationofadenoma.Fromnormalcelltocancercells,itwillneed10~15years
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