Özet:

The objective: Local advanced stage is to investigate the role of magnetic resonance imaging (MRG) in the assessment of the reaction of neoadjuvakne moradiotherapy (KRT) in patients with rectum cancer. Patients and Method: In the 6-8 weeks after CRT, total mesorectal exceeds between the years 2015-2020 were applied to 24 local advanced stages of rectum cancer, before and after CRT, T2-weight and Diffusion Weight Images (DAG) were evaluated as a retrospective type. Radiologically, it was evaluated in terms of mass morphology, localization, size, mrT, mrN evolution and extramural vascular invasion (EMVI). Residuous scores in post-KRT images; 0: there is no residuous mass, 1: there is fibrotic wall thickness, not observed manifest residuous mass, 2: residuous mass is made in the form. Regression ratings were as follows: 1: No tumor, 2: Good response, mostly fibrosis, 3: more than 50% fibrosis and myus, 4: Weak response, 5: No response. The findings: a significant decline in the chronic longness of the post-CRT tumor and an increase in the average of the Apparent Diffusion Coefficient (ADC) (p=0,001) were observed. The post-KRT phase with histopathological T (pT) showed a meaningful, strong correlation (r=0,54, p=0,006). Pre-KRT EMVI and perinoral invasion (PN Ia) had a significant correlation (r=0,53, p=0,008). The recidive score determined a meaningful and k-involved correlation between the regression score (r=0,6; p=0,001), pT (r=0,48; p=0,02) and the tumor length (r=0,51; p=0,01). The regression degree indicated a significant correlation with the EMVI (r=0,43, p=0,036), PNI (r=0,46, p=0,02), pT (r=0,41; p=0,048), pN (r=0,55; p=0,006) and the metastatic/total lymph nod ratio (r=0,46; p=0,02). The result: Local advanced stage of rectum cancer in neoadjuvanK RT shows a strong correlation with postoperative pathological assessment of MRG. As in the primary evolution, the MRG is also headless in the post-evolution. The evaluation of the response to the treatment with the MRG regression rating can contribute to the surgical plan.