[Anterior Mediastinal Myxoid Liposarcoma Detected by Chest Computed Tomogram in the Patient with Pneumothorax].

A 57-year-old woman visited our hospital with left chest pain. Chest computed tomography (CT) scanning showed left pneumothorax with apical bullae and a nodular shadow in the left anterior mediastinum accidentally. However, a week later, we could not detect a mediastinal shadow on chest CT image after healing of left pneumothorax. Video assisted thoracoscopic surgery was scheduled in order to remove bullae and evaluate an anterior mediastinal lesion. The mediastinal lesion was tumorous and resected with around pericardial fat tissue. Pathological diagnosis was a myxoid liposarcoma of 15×10mm in size without infiltration into the surrounding tissue. The postoperative course was uneventful without recurrence 6 months later.