The longitudinal ileotransversostomy forming method according to which the ileum is divided at an angle of 45 degrees to the mesentery edge, forming a single layer anastomosis end to the side at an angle of 45 degrees in isoperistaltic mode, was elaborated. Clinico-experimental investigations were conducted on 45 mongrel dogs. Method was applied in 6 patients with malignant tumor of caecum and colon ascendens.
