[A case of invasive thymoma in the left hilus of the lung].

Reported is the case of a 62-year-old man who was admitted to our hospital because of the presence of a left hilar mass found during a routine chest X-ray examination. Shortly thereafter, a left thoracotomy was performed. The tumor was located under the aortic arch in the left hilus of the lung and had invaded the pericardium and pulmonary trunk. There was no connection, however, to the anterior mediastinum. A histological examination revealed an invasive thymoma of epithelial cell of the predominant type. Seen scattered abroad were thymic tissue in the adipose tissue around the tumor of the left hilus. Postoperatively, a distant metastasis of the right lung was observed and the patient died due to respiratory failure.