MRI VISUALIZATION OF THE POST-TREATMENT CHANGES OF THE INVASIVE TUMORS OF THE RECTUM AND THE ANAL CANAL
Criteria for MRI visualization of the post-treatment changes of the invasive tumors of the rectum and the anal canal remain controversial in aspects of tumor response. The study included 22 patients with lesions of the anal canal and 26 patients with malignant tumors of the ampoule of the rectum. Dimensions and measured apparent diffusion coefficient (ADC) of the tumor were compared before and after chemoradiotherapy. The study determined that patients with partial response and stabilization of the tumor according to the RECIST 1.1 criteria marked increase in ADC values (ADC).