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Cytoreductive surgery (CRS) and intraperitoneal chemotherapy are effective in the treatment of ovarian peritoneal carcinomatosis (OPC). Colon resection is often required to achieve maximal cytoreduction during CRS. The success of complete mesocolic excision (CME) and total mesorectal excision (TME) in the surgical treatment of primary colorectal tumors is well-known. Our study aimed to investigate the factors affecting mesocolic lymph node metastasis (MLNM) and the contribution of CME/TME techniques to maximal cytoreduction in patients diagnosed with ovarian peritoneal carcinomatosis (OPC) with colon metastasis. Between 2004–2020, 30 patients who underwent colorectal resection with CME/TME techniques due to OPC-related colon metastasis were retrospectively analyzed. The median age of patients was 61 (33–86). Six (20%) patients underwent total colectomy, 7 (23%) subtotal colectomy, 6 (20%) right hemicolectomy, 4 (13%) left hemicolectomy, and 7 (23%) rectosigmoid resection. Histopathological diagnosis was high-grade serous carcinoma in 29 (97%) patients, and malignant mixed Mullerian tumor in 1 (3%) patient. MLNM was detected in 17 (56%) of 30 patients. There was a significant relationship between MLNM and pelvic and para-aortic lymph node metastasis (PALNM) ( p  = 0.009) and lymphovascular invasion in primary ovarian tumors ( p  = 0.017). There was no significant relationship between MLNM and depth of colonic invasion ( p  = 0.463), histological grade ( p  = 0.711), and primary/secondary surgery ( p  = 0.638). MLNM was seen in 8 (47%) of 17 patients with only serosal invasion. A high rate of MLNM can be seen in OPC-induced colon metastasis regardless of the degree of colon wall invasion. In patients with PALNM, the frequency of MLNM increases. We believe that if colon resection is to be performed in OPC, a colectomy should be performed by CME/TME principles to achieve maximal cytoreduction.

acta chirurgica belgica

Is complete mesocolic excision or total mesorectal excision necessary during cytoreductive surgery in ovarian peritoneal carcinomatosis with colonic involvement?