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T staging of rectal cancer according to depth of tumor invasion as seen on axial T2-weighted MR images. (a) T1 cancers invade the submucosa (arrows) but do not involve the muscularis propria. (b) T2 cancers invade the muscularis propria but do not reach the subserosa (arrow). (c) T3 cancers invade beyond the muscularis propria (arrow). (d) T4 cancers invade through the serosal covering (T4a) or another fascial plane (T4b) and/or involve an adjacent organ (T4b) (arrows).
