However, perforation of the colorectum by an IUCD is extremely unusual.

但是子宫内避孕器引致直肠穿孔的病例就极为罕见。

The higher en bloc resection rate for ESD suggests that it should be the first option for resection of suspected superficial submucosal cancers in the colorectum.

内镜粘膜剥离术具有更高整块切除率，表明它是疑似表层黏膜下癌切除术的第一选择。