Inclusion Criteria:

- Colon cancer at any stage diagnosed histologically or high degree of suspicion for
colon cancer at endoscopy, which cannot be confirmed with certainty in the biopsy.
The diagnosis of cancer must be certain in the definitive histology.

- Possibility of transabdominal injection of the dye (cancers below the peritoneal
reflection in which the injection of dye must be carried out through rectoscopy, are
therefore excluded).

- Patient's informed consent

Exclusion Criteria:

- Prior intrabdominal tumor surgery

- Other preexisting malignancies

- Hypersensitivity/allergy to dye (isosulfan blue)

- Pregnancy

- Breast-feeding

- No patient's informed consent