Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube terminating 4 .0 cm above the carina , multiple intact sternal wires , a Swan - Ganz catheter terminating at the right ventricular outflow tract , and an OG tube terminating within the stomach are unchanged in position since the 2 :39 p .m . examination . The cardiac and mediastinal contours remain unchanged . There is persistent left retrocardiac opacity which is minimally changed since the ___ radiographs . There is no pneumothorax .
    OUTPUT:
    
Minimal change of a left retrocardiac opacity since the 2 :39 p .m . examination , which may reflect any combination of atelectasis , consolidation , and / or effusion .