Teenager with acute chest pain

CT of mediastinal teratoma
CXR (above left) shows a mass in the left hemithorax. Coronal (above right), axial (below left) and sagittal (below right) CT with contrast of the chest show a large mass of soft tissue and fat density in the anterior mediastinum that compresses the left lung posteriorly and causes mediastinal shift to the right.

The diagnosis was mediastinal teratoma.