Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided prepectoral intracardiac device in situ with the lead tips in the right atrium and right ventricle . Mild cardiomegaly . No pulmonary edema . Left central airspace opacification just lateral to the hilum . Persistent left - sided pleural effusion is unchanged in size .
    OUTPUT:
    
Airspace opacification in the left mid lung zone just lateral to the hilum , which may represent focal pneumonia or a pulmonary mass . Follow - up CXR post antibiotic treatment or CT may be considered .