方法：应用半薄切片和超薄切片技术行光镜及电镜观察大鼠直肠肛梳区的淋巴管结构。
METHODS: The lymphangial configuration was observed under a light microscope and a transmission electron microscope by using semi-thin sections and ultra-thin sections technique respectively.
术前MRI分期联合腹腔镜tme术能更好地控制切缘，但保肛率无明显差异，有待样本量增多后继续观察。
Combining preoperative MRI staging with laparoscopic TME has better cutting edge control, but there isn't difference about anus keeping rate, therefore we need to observe more samples.
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