| Summary: | One of the main causes of local recurrence of rectal cancer is the regional lymphatic nodes metastasis. Existing methods of staging does not have absolute sensitivity and specificity with regard to lesion of regional lymphatic nodes in general, and of lateral group in particular. It is necessary to look for new methods of diagnosis, to identify risk factors and unfavorable prognosis of lateral metastasis in colorectal cancer, which will provide a more differentiated approach to the choice of treatment policy, indications for neoadjuvant chemoradiotherapy and/or lymphatic node dissection. The work on the two groups of patients (control and basic) was performed on the basis of CT performed in angio mode and MRI investigated anatomical variability of middle rectal arteries, proved its impermanence, and studied the relationship between presence of the middle rectal artery and lesion of regional lymphatic nodes in rectal cancer. Prognostic risk factors for lateral metastasis in rectal cancer were proposed, comparative analysis techniques allowing for visualization of the middle rectal vessels was performed.
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