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63-year-old female patient treated with CRT for rectal cancer. Transverse T2 weighted images before (a) and after (b) neoadjuvant treatment. Before treatment, the MRI stage based on morphological criteria was mrN1 and the largest suspicious lymph node 4 mm (a, white arrow). After CRT, the lymph node was reduced to 2.5 mm (b, white arrow) resulting in ymrN0. Pathological staging was ypN1 due to one 2 mm remaining small metastasis. CRT, chemo-radiotherapy.
