“…Typically, they arise from the anterior mediastinum (thymus) and can become quite large, potentially leading to cardiopulmonary compromise. Less frequently, thoracic teratomas may arise from the posterior mediastinum, aorta, esophagus, pericardium, lung, and diaphragm [4][5][6][7][8][9][10]. The lateral chest cavity, including the costovertebral sulcus and the costophrenic sulcus, is even more rare a location to arise [11].…”