Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided Port - A - Cath is in unchanged position and terminates in the low SVC . A tracheostomy is in unchanged position . A nasogastric tube is again seen with the distal tip not visualized . Stable mild cardiomegaly . Mediastinal and hilar contours are unchanged . Stable minimal pulmonary vascular congestion . Apparent interval increase in bibasilar opacities may reflect low lung volumes .
    OUTPUT:
    
Apparent interval increase in bibasilar opacities may reflect low lung volumes .