The incidence of colorectal cancer in the European Union is in continuous growth and approximately 15% of the cases present with a hereditary component, the most frequently encountered associations being with the Lynch syndrome and familial adenomatous polyposis. Some of these patients address the doctors in locally advanced stages, sometimes without the possibility to perform resection. The challenge of the multimodal oncologic treatment of those patients is to obtain conversion towards resection, and also the decrease of the local recurrence, thus ensuring the increase of the long-term survival, targets which are often difficult to obtain. We present the case of a 54-year-old patient with locally advanced rectal cancer, who benefitted from multimodal treatment: neo-adjuvant chemotherapy and radiotherapy, and also from surgical intervention.