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Chinese Journal of Medical Ultrasound (Electronic Edition) ›› 2021, Vol. 18 ›› Issue (04): 337-343. doi: 10.3877/cma.j.issn.1672-6448.2021.04.001

Special Issue:

• Abdominal Ultrasound •     Next Articles

Value of three-dimensional transrectal ultrasound in diagnosis of rectal mucinous adenocarcinoma and non-mucinous adenocarcinoma: a matched case-control study

Min Liu1, Wei Zheng1, Ying Liu1, Xiaoqing Pei1, Feng Han1, Xi Lin1, Jianhua Zhou1, Anhua Li1,()   

  1. 1. Department of Ultrasound, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou 510000, China
  • Received:2020-06-17 Online:2021-04-01 Published:2021-05-08
  • Contact: Anhua Li

Abstract:

Objective

To evaluate the value of three-dimensional (3D) transrectal ultrasound (TRUS) in the diagnosis of rectal mucinous adenocarcinoma and non-mucinous adenocarcinoma.

Methods

This study retrospectively analyzed the clinicopathological data and the characteristics of 3D TRUS images of 35 patients with rectal mucinous adenocarcinoma. Rectal mucinous adenocarcinoma patients were paired with rectal non-mucinous adenocarcinoma patients in the same period at 1:1 (patient's age, ± 2 years old, same gender and pathological T stage of the tumor, and distance form lesion to anal verge of ± 1 cm). The differences in the 3D ultrasonic image features of the two groups were compared. Multivariate logistic regression was used to analyze the predictors of ultrasonic characteristics of mucinous adenocarcinoma, and the diagnostic efficacy of the predictors was calculated by using a four-grid table.

Results

Compared with non-mucinous carcinoma, mucinous carcinoma had longer infiltrating segment [(45.20±20.09) cm vs (37.69±11.38) cm)]. The long-axis layered sign or concentric cross-sectional sign was a typical ultrasound feature in mucinous carcinoma, accounting for 77.1% (27/35), while it was not found in non-mucinous adenocarcinoma. The main pattern of mucinous carcinoma was flat type (51.5%, 18/35) whereas non-mucinous carcinoma was characterized by elevated type (94.3%, 33/35). The above differences were statistically significant (P<0.05 for all). Conditional logistic regression analysis showed that the long-axis layered sign or cross-sectional concentric sign was a typical feature in the diagnosis of rectal mucinous adenocarcinoma, with an odds ratio (odds ration = 10.720, 95%CI: 2.429-47.300), and its sensitivity, specificity, accuracy, positive predictive value, and negative predictive value were 77.1%, 100%, 88.6%, 100%, and 81.4%, respectively.

Conclusion

3D TRUS can effectively diagnose rectal mucinous adenocarcinoma and non-mucinous adenocarcinoma before treatment.

Key words: Rectal neoplasms, Mucinous adenocarcinoma, Imaging, three-dimensional, Transrectal ultrasonography

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