Intra-operative fluorescent imaging of the tumor border and sentinel lymph nodes in rectal and sigmoid cancer

Interventions: After general anesthesia, prior to incision, ICG;NanoColl will be injected endoscopically around the tumor. During surgery, fluorescence imaging will be performed to visualize tumor border and lymph nodes.
Primary outcome(s): 1. Percentage of patients in whom SLN identification was possible using NIR fluorescence imaging
2. Percentage of patients in whom intraopertive detection of the tumor border was possible by NIR fluorescence imaging
Study Design: N/A: single arm study, Open (masking not used), N/A , unknown, Parallel