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Fig. 11 | Insights into Imaging

Fig. 11

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

Fig. 11

DWI for assessment of lymph nodes. Pre-CRT T2-weighted (a), b1000 DWI (b), and corresponding post-CRT T2-weighted (c) and b1000 DWI (d) images of a male patient with a low rectal tumor. On the pre-CRT images, several lymph nodes are visible (arrowheads). Note that the nodes are much easier detectable on DWI and that more nodes can be appreciated on DWI compared to T2-weighted MRI. After CRT, all the lymph nodes have vanished, both on T2W as well as on DWI. The absence of nodes on DWI is a reliable sign indicating a ypN0 stage (which was later confirmed at histopathology after surgery in this patient)

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