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Insights into Imaging
Fig. 10 | Insights into Imaging

Fig. 10

From: Response evaluation after neoadjuvant treatment for rectal cancer using modern MR imaging: a pictorial review

Fig. 10

Patterns of response on DWI. Pre-CRT T2-weighted (a, d), post-CRT T2-weighted (b, e), and corresponding post-CRT b1000 DWI (c, f) images of two male patients treated for low rectal tumors. In the upper patient, a semicircular solid mass is visualized before treatment (a). After CRT, a focal fibrotic wall thickening is observed (arrows in b), without a clear residual mass. On DWI, a focal high signal is observed at the inner margin of the fibrosis (arrowhead in c), which was later histopathologically confirmed to be a ypT2 tumor remnant. The patient in the bottom row has a large, irregular circular tumor mass pre-CRT (d). After CRT, an irregular and slightly heterogeneous fibrotic wall thickening was observed (arrows in e) with small spots of high DWI signal (arrowheads in f) scattered throughout the fibrosis. This patient was confirmed to have a ypT3 tumor remnant at histopathology

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