We present the chest radiograph, computed tomography (CT), and magnetic resonance imaging (MRI) findings of three pericardial gossypibomas, which are rarely reported and an exceptional complication of cardiovascular surgery. The diagnosis is usually possible with surgical history, high clinical suspicion, and awareness of variable imaging findings. Usage of sponges with radiopaque markers facilitates early detection by chest radiographs and CT. In case of radiolucent gossypibomas, specific MRI features help to differentiate this pathology from other masses and diffusion-weighted images can be used to distinguish it from an abscess.