Infant with respiratory distress

CXR and CT of mediastinal teratoma
CXR PA (above left) shows a large mediastinal mass in the left hemithorax causing mediastinal shift to the right while the CXR lateral (above right) shows the mass filling the anterior mediastinum. Axial CT with contrast of the chest (below) shows the mass is heterogenous in nature containing low density fat, high density calcification and soft tissue. The CT also shows the mass arising from the anterior mediastinum and extending primarily to the left resulting in mediastinal shift to the right.

The diagnosis was mediastinal teratoma.