Coronary artery bypass grafting (CABG) is one of the most commonly performed surgeries. Clinicians often assume that a sternal scar or sternal wires seen on radiographic images are evidence of previous CABG. However, these wires could be related to other cardiothoracic surgeries. Incorrectly assuming that patients have coronary artery disease can affect their future management and increase healthcare costs. This article discusses two patients who were misidentified as having previous CABG based on the presence of sternal wires on chest radiographs.