MRI restaging of rectal cancer: The RAC (Response–Anal canal–CRM) analysis joint consensus guidelines of the GRERCAR and GRECCAR groups

•The evaluation of tumor response in rectal cancer is a challenge for the radiologist.•The main features to evaluate can be summarized through the “RAC assessment: Response–Anal canal– Circumferential resection margin”.•The combination of functional and morphological tumor features on MRI helps assess rectal tumor response to neoadjuvant therapy.•After a near complete tumor response on MRI, another MRI evaluation at six to ten weeks is recommended to potentially propose a watch and wait approach.