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. 2016 Jul 18;3:145–152. doi: 10.1016/j.ejro.2016.06.003

Fig. 3.

Fig. 3

Partial response. MR images of a 55-year old woman classified as partial responder both on combined set of conventional and DW images and on T2-weighted images. (a) Pre-CRT axial T2-weighted image shows wall thickening of the middle rectum (white arrow) with spread into the perirectal fat for less than 10 mm; there are also some lymph nodes (white arrowhead) into the mesorectal fat (T3b N2). (b) Pre-CRT DW (b = 800 s/mm2) image shows high signal intensity area in the corresponding tumor (white arrow). (c) Pre-CRT ADC map at the same level shows low signal intensity area due to the pathological tissue (white arrow). The mean ADC value was 0.804 × 10−3 s/mm2. (d) Post-CRT axial T2-weighted image shows tumor shrinkage and intermediate signal intensity tissue in the rectal wall, not clearly depicted as fibrosis. (e) Post-CRT DW (b = 800 s/mm2) image shows reduction of the high signal intensity area, which is now limited to a focal spot in the rectal wall (white arrow). (f) Post-CRT ADC map at the same level shows a focal low signal intensity area corresponding to the residual tumor (white arrow). The mean ADC value was 1.237 × 10−3 s/mm2. (g) Photomicrograph (H&E x800). Intermediate regression (TRG: 2 + 3), predominance of the fibrous reaction induced by the treatment and few tumor remnants.