Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates a tracheostomy , with the tip in the mid thoracic trachea . There is mild cardiomegaly , possibly accentuated by low lung volumes and patient positioning . There is bibasilar atelectasis , without identification of a definite focal consolidation . No large pleural effusion or pneumothorax is seen . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Tracheostomy in appropriate position .