Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph again demonstrates an endotracheal tube terminating in the mid thoracic trachea , left chest tube , left subclavian line terminating in the mid SVC , and enteric tube extending below the diaphragm in terminating in the stomach , all unchanged in position . Lung volumes are lower , with bronchovascular crowding . Even allowing for this , there appears to be increased opacity in the left base , which likely reflects atelectasis . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Increased opacity in the left base , likely reflecting a combination of bronchovascular crowding and increased atelectasis . However , superimposed infection can not be excluded in the appropriate clinical setting .