A topoanatomical study of the anterior perineal plane for the application of ultra-low anterior resection of the rectum / 中华普通外科杂志

ABSTRACT

Objective To study the topoanatomy of anterior perineal plane and adjoining tissue structure in the preparation of ultra-low anterior resection of the rectum. Methods Dissection was performed on 16 male cadavers of semi-pelvis sectioned in the saggital plane. Eight indexes were measured and recorded. Results Anterior perineal plane was clearly found in all 16 cadavers. The median distance of rectum-urethra (R-U) was 14 mm (ranging 10 -17 mm). The contour of perineal body was trapezoid,which was narrow cranially and broad caudally. The median width of cranial perineal body was 8 mm (ranging 6 -9 mm), while the median width of caudal perineal body was 21 mm (ranging 18 -23 mm).The median numerus of thickness of perineal body (TPB), thickness of puborectalis (TPR), arrterior wall of rectum (aPR) -D, pPR-D and width of pelvic diaphragm (WPD) were 20. 5 mm ( ranging 17 - 23 mm),12 mm(ranging 10 -16 mm), 25 mm(ranging 21 -27 mm), 20 mm(ranging 16 -23 mm) and 8 mm (ranging 6 - 10 mm) respectively. Conclusions Anterior perineal plane clearly exists, through which about 20 mm more length of the distal rectum is available which could increase the sphincter-saving rate in cases of low rectal carcinoma.