直肠解剖和分期2最佳的治疗方案？化疗？放疗？手术？How？T？T1、T2、T3TME＆CRM38%↓10%直肠系膜筋膜是否受累？直肠系膜＆直肠系膜筋膜？直肠系膜直肠筋膜15骶前筋膜骶前筋膜盆脏筋膜构成直肠系膜筋膜Themesorectalfascia,orviscerallayeroftheendopelvicfascia,encirclestherectumandthemesorectalfat,nodes,andlymphaticvesselstoformadistinctanatomicunit.Themesorectalfasciarunsalongtheanterioraspectofthesacrum,whereitfuseswiththepresacralfascia,andthenlaterallyoneithersideoftherectum,whereitiseasilyidentifiedonaxialT2-weightedimagesasathinhypointenseline1920MRI成像技术与解剖清肠、排空膀胱23Series25262728293031肛门直肠环：肛门外括约肌深、浅部、直肠壁纵行肌、肛门内括约肌、耻骨直肠肌直肠癌T分期34T1期36T2期38394041T3期434445T4期直肠癌累及腹膜4849直肠癌累及肛门括约肌51525354555mm肿瘤侵及直肠系膜深度5960决定预后的2大因素！淋巴结转移大小？信号？形态？64形态不规则或边缘呈针状突起6667总结SuggestedChecklistforUsePriortoMRImagingofRectalCancerMRI的应用选择正确的治疗措施准确的肿瘤分期！谢谢！