Extrapulmonary sequestration mimicking mediastinal cyst: report of two identical cases.

Extrapulmonary sequestration (EPS) is a rare congenital anomaly usually diagnosed during the first six months of life. It is mostly found between the left lower lobe of the lung and the diaphragm. Mediastinal presentation is extremely rare. We describe two identical cases of extrapulmonary sequestration mimicking mediastinal cystic mass in two boys. These emphasize the need to keep this diagnosis in mind when dealing with children presenting with anterior mediastinal mass.