Fig. 2.

Tumor morphology detected on magnetic resonance images. (A) Distance from the lower margin of the tumor to the anal margin. (B) Length of tumor involvement. (C) Maximum tumor diameter. (D) The proportion of the tumor in relation to the circumference of the intestinal wall. The red line outlines part of the tumor, and the brown color represents the whole intestinal wall. (E) Depth of tumor invasion to the mesorectum. (F) Involvement of the circumferential resection margin (red arrow). (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)