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| Demonstration of rectal cancer with the extent of wall invasion as an criteria forimproving accuracy of MRI-T staging |
| CAO Wu-teng, ZHOU Zhi-yang, LIAN Yan-bang, GONG Jia-ying, XIONG Fei, LIU De-chao |
| Department of Radiology, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou 510655, China |
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Abstract Objective: To investigate the value of conventional T staging for rectal cancer and which combined with the extent of tumor invasion of the circumference of rectal wall in T staging for rectal cancer. Methods: The conventional T staging in 79 cases with rectal cancer and that combined with tumor invasion of the circumference of the bowel wall based on MRI were analysed and compared retrospectively. On low field MRI system, when there was difficulty in discriminating stage T2 and stage T3 rectal cancer, then try to find tumor invasion of intestinal wall circumference based on MRI. The cirteria of invasion of bowel wall circumference set for T2 and T3 was <1/2~1/2 the circumference was considered as stage T2, >1/2 of the circumference as T3. Use postoperative pathologic T staging as standard, the value of conventional T staging and which combined with invasion of the circumference of the rectal wall was compared. Results: Based on conventional T staging and that combined with invasion of the circumference of rectal wall and only conventional T staging, the Kappa pathological T staging values were 0.688 and 0.331 respectively(P<0.05). The parameters for staging≤T2 and T3/T4 based on tumor invasion of rectal circumference in T staging are superior to those based on conventional staging alone, the former AUC(area under the ROC curve) value is higher than the latter(0.905 vs 0.662, P<0.05). Conclusion: The conventional T staging for rectal cancer combined with invasion of the circumference of rectal wall can improve the accuracy of T staging for rectal cancer, especially improving the discrimination between T2 and T3 so as to provide effective information for clinicians and surgeons.
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Received: 12 August 2013
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2014, Vol. 25 
