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Chinese Journal of Clinicians(Electronic Edition) ›› 2025, Vol. 19 ›› Issue (05): 367-373. doi: 10.3877/cma.j.issn.1674-0785.2025.05.006

• Clinical Research • Previous Articles    

Predictive value of perirenal fat area measured by CT for anastomotic complications after laparoscopic intersphincteric resection

Mei Wang1, Yong Zhao1, Jian Zhang2, Lina Zhang1, Jianhua Ding1, Yu Cao1,()   

  1. 1Department of Colorectal Surgery, The Characteristic Medical Center of PLA Rocket Force, Beijing 100088, China
    2Department of Radiation Therapy, The Characteristic Medical Center of PLA Rocket Force, Beijing 100088, China
  • Received:2025-05-29 Online:2025-05-15 Published:2025-08-22
  • Contact: Yu Cao

Abstract:

Objective

To explore the predictive value of obesity-related metrics based on CT measurements for anastomotic complications within three months after laparoscopic intersphincteric resection (Lap-ISR).

Methods

A total of 192 patients who underwent Lap-ISR for ultra-low rectal cancer at the Characteristic Medical Center of PLA Rocket Force from May 2022 to June 2024 were included. Data on anastomotic complications within three months after surgery were collected. The patients were divided into groups based on the occurrence of complications. Univariate analysis was performed to screen risk factors, and further multivariate logistic regression analysis, gender-stratified analysis, and receiver operating characteristic (ROC) curve analysis were conducted to evaluate the predictive effectiveness of visceral fat area (VFA) and perirenal fat area (PFA) for Lap-ISR anastomotic complications.

Results

The incidence of anastomotic complications was 18.2% (35/192). Univariate analysis showed that male gender (P=0.013), diabetes (P=0.036), partial ISR (vs subtotal/complete ISR, P=0.026), VFA≥100 cm2 (P=0.009), and PFA ≥25 cm2 (P=0.007) significantly increased the risk of anastomotic complications. Multivariate logistic regression confirmed that male gender (odds ratio [OR]=2.84, 95% confidence interval [CI]: 1.12~7.21, P=0.042), VFA≥100 cm2 (OR=3.12, 95%CI: 1.15~8.45, P=0.028), and PFA ≥25 cm2 (OR=4.25, 95%CI: 1.82~9.92, P=0.006) were independent risk factors. Gender-stratified analysis showed that PFA≥25 cm2 was significantly associated with complications (P=0.032) only in males, but not in females (P=0.62). ROC curve analysis showed that PFA had a better predictive performance (area under the curve [AUC]=0.659, 95%CI: 0.549~0.769, P=0.003) compared to VFA (AUC=0.642, 95%CI: 0.530~0.754, P=0.009).

Conclusion

PFA is a reliable indicator for predicting anastomotic complications after Lap-ISR, with particular significance for male patients. A preoperative PFA≥25 cm2 indicates a high risk, suggesting that surgery should be performed by an experienced surgeon with enhanced perioperative management.

Key words: Ultralow rectal cancer, Intersphicteric resection, Anastomotic complications, Obesity, Perirenal fat

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