Colorectal tumor with histology other than adenocarcinoma or adenoma.

Colon cancer located in the right colon, transverse, splenic or non-sigmoid left colon.

Metastatic disease (M1).

History of colorectal cancer surgery, different from a local excision.

Inflammatory bowel disease with anatomopathological confirmation.

Patients with psychiatric illness, addiction or any disorder that impedes the understanding of informed consent.

Inability to read or understand any of the languages of the informed consent (Catalan, Spanish).

Another synchronous malignant disease.

Emergency surgery.

Complete Mesocolon Excision vs Locoregional Lymphadenectomy in Sigmoid Colon Cancer (CMELL)