A 30-year-old woman applied to our hospital because of back pain. Total atelectasis was seen in the left hemithorax at the chest X-ray. Computed tomography (CT) revealed decreased left lung volume and mediastinum deviated to the left hemithorax. Bronchoscopy showed concentric stenosis in the left main bronchus. According to these findings, left thoracotomy and pneumonectomy were performed. Pathologic diagnosis was lymphoepithelioma-like carcinoma.Lymphoepithelioma-like carcinoma is an undifferentiated carcinoma that shows prominent lymphoid infiltration within the fibrous stroma. It is commonly seen in the nasopharynx. Most recently it was diagnosed as a primary lung tumor.