Here’s a concise, critical review of the (Right Internal Mammary Artery) used in coronary artery bypass grafting (CABG). Review: The RINA Classification for Arterial Grafts in CABG Context: The RINA classification (proposed by Sá et al., JTCVS Open , 2021) is a novel anatomical and surgical schema for using the right internal mammary artery (RIMA) as a conduit—often as a composite graft from the left internal mammary artery (LIMA) or as an in-situ graft.