Objective To investigate the influential factors of transverse diameter of mesorectum in adults based on magnetic resonance imaging (MRI). Methods Clinical data of 100 patients who met the inclusion criteria and then treated with MRI on pelvic cavity were analyzed retrospectively. The 100 cases (42 males and 58 females) aged from 27~83 years old. On the axial MR T1WI, the following parameters were measured at the seminal vesicle/uterine body level: the maximal transverse diameter of mesorectum, bladder and rectum, and the interval of the bilateral femoral head, the thickness of anterior abdominal subcutaneous fat tissue, the uterus maximal transverse diameter of female. The correlation between the maximal transverse diameter of mesorectum and the above measured parameters was analyzed statistically. Results (1) According to the data of 58 females cases, the maximal transverse diameter of mesorectum was (7.15±0.97) cm, uterine maximal transverse diameter was (5.86±0.61) cm. There was no statistical correlation between the maximum transverse diameter of the mesorectum and the transverse diameter of the uterus (P＞0. 05). (2) The data of male and female were combined for statistical analysis: the maximal transverse diameter of mesorectum was (7.15±0.87) cm. The maximal transverse rectum diameter was (2.84±0.74) cm, and the maximal transverse diameter of bladder was (8.58±1.66) cm. The interval of the bilateral femoral head was (12.79±0.96) cm. The thickness of anterior abdominal subcutaneous fat tissue was (2.01±0.76) cm at the same level. There was no statistical correlation between the transverse diameter of the mesorectum with gender, age, and the transverse diameter of the bladder (P＞0.05). It was positively correlated with the thickness of subcutaneous fat tissue in the anterior abdominal wall, the transverse diameter of the rectum, and the interval of the bilateral femoral head (t=3.807, 2.612, 2.002, P<0.05). Set the transverse diameter of mesorectum (Y) as the dependent variable, with the thickness of anterior abdominal fat tissue (X1), rectal transverse diameter (X2), the interval of the bilateral femoral head (X3) as the independent variables, the regression equation was: Y=3.500+0.389 X1+0. 275 X2+0.163 X3, P＜0.05, R2=0.522. Conclusions The mesorectal transverse diameter is related to the interval of the bilateral femoral head, the thickness of fat tissue in the anterior abdominal wall and the transverse diameter of the rectum. Observing and measurement of the mesorectal transverse diameter is helpful for the clinical diagnosis and treatment of the rectal lesions.
Key words
Magnetic Resonance Imaging /
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Mesorectum /
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Rectum /
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Influencial factor
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