Objective: Assessing short-term and long-term results of multivisceral resections (MVR) performed for rectal cancer (RC) with invasion into adjacent pelvic organs, as well as the effectiveness of bladder reconstruction with the formation of a urinary reservoir of «low» pressure. Methods: The work was based on the results of surgical treatment of 37 patients with locally advanced or primary multiple RC underwent MVR. Invasion of adjacent small organs was observed in 89.2%, primary multiple malignant tumors (PMMT) – in 10.8% of patients included in the study. Results: According to the preoperative examination of tumor infiltration of one adjacent organ was diagnosed in 20 (54.1%), two or more organs – in 17 (45.9%) observations; more often affected the bladder – in 18 (48.6%) cases. Volumes of performed operations: in 6 (16.2%) cases of complete pelvic organs evisceration, in 10 (27%) cases of MVR with rectal extirpation, in 21 (56.8%) cases of MVR with resection of the rectum and adjacent organs. More often in 27 (72.9%) patients, there was urinary tract resection, of which 11 (29.7%) patients underwent primary bladder repair with the formation of ortho- (n=3) or heterotopic (n=6) urinary reservoir of «low» pressure. Postoperative complications developed in 14 (37.8%) patients, what required re-surgery in 8 (21.6%) observed, of which urological complications occurred in 4 (10.8%) patients. Complications were not observed during the formation of the artificial bladder according to the presented method. Long-term results: RC – overall and disease-free 2-year survival – 78.1% and 65.6% respectively, PMMT – all patients are alive without signs of relapse, the timeline of observation is 24 months. Conclusions: The immediate results of MVR on locally advanced RC can be considered as satisfactory. The level of postoperative complications is primarily due to the prevalence of primary tumors. In case of urinary tract resection, primary plastic surgery is preferred. Long-term results allows to examine such operations as a method of choice in the treatment of RC with invasion in adjacent organs. Keywords: Rectal cancer, surgical treatment, multivisceral resection, bladder reconstruction, postoperative complications, disease-free survival.

Background.Currently, the indications for multivisceral pelvic resections have increased dramatically. However, short-and long-term outcomes after these resections for locally advanced rectal cancer remain a subject of debate.The purposeof the study was to evaluate short-term surgical and oncological outcomes after multivisceral pelvic resections in patients with locally advanced rectal cancer.Material and methods. We analyzed surgical outcomes in 32 patients (13 men and 19 women) aged 44-69 years, with locally advanced rectal cancer, who were treated between 2010 and 2016. Of the 32 patients, 28 (87.5 %) had rectal cancer with invasion into adjacent organs (posterior wall of the bladder - 13, uterus - 10, ureters - 5, prostate - 4, vagina - 3; simultaneous damage to more than 2 organs - 14, multiple primary malignant tumors: rectal cancer + bladder cancer - 2, rectal cancer + endometrial cancer - 1, rectal cancer + rectal GIST - 1.Results.Total pelvic evisceration was performed in 6 (18.8 %) cases, combined resection of the rectum and adjacent organs was performed in 26 (81.2 %). Urinary tract resection was performed in 24 (75.0 %) patients. Of these patients, 13 (40.6 %) had primary plasty of the bladder and/or ureters. Postoperative surgical complications were observed in 11 (34.4 %) patients, of whom 7 (21.8 %) patients needed re-surgery. In 1 patient (3.1 %), who died in the early postoperative period, the cause of death was thrombosis of the right iliac vessels with subsequent acute renal failure. For patients with locally advanced rectal cancer, long-term outcomes were as follows: the overall and recurrence-free 2-year survival rates were 75 % and 56.3 %, respectively. All patients with multiple primary malignant tumors were alive with no evidence of disease recurrence at a follow-up of >24 months.Conclusion.Multivisceral resection in patients with locally advanced rectal cancer is a complex surgical procedure requiring the multidisciplinary team of surgeons. Despite high operative morbidity, proper perioperative management of the patients helps to achieve satisfactory immediate treatment outcomes. Long-term outcomes allowed us to consider such resections as a method of choice for locally advanced and multiple primary rectal cancers.