Intrasternal respiratory epithelium–lined foregut cyst

Foregut or enterogenous cysts are the result of an abnormal budding or division of the primitive foregut and are usually found in adults. On the basis of histologic features and embryogenesis, they are classified into bronchogenic, esophageal, gastroenteric, and neuroenteric cysts and usually occur in the mediastinum or, less frequently, in the soft tissues of the chest wall. Intrasternal foregut cysts lined by respiratory epithelium have never previously been described in the literature, and we present here the first case.