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Large avidly enhancing endobronchial mass in the proximal left mainstem bronchus with distal atelectasis and hypodense bronchoceles distally. The centrally located mass has no cavitation or foci of calcification. Associated left hemithorax volume loss as evidenced by mediastinal shift, the elevation of hemidiaphragm and rib crowding. Small left pleural effusion. No hepatic or adrenal lesion.