Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal semi-upright portable chest radiograph demonstrates stable cardiomegaly . Mediastinal and hilar contours are unchanged . Mild increased prominence of interstitial markings likely exagerated by low lung volumes . No dense focal opacifications identified . No pleural effusion or pneumothorax evident . No osseous abnormality evident . Enteric catheter courses below left hemidiaphragm and out of view . Endotracheal tube terminates 2 .5 cm above the carina .
    OUTPUT:
    
No focal opacification . Stable cardiomegaly .