Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild increase in the retrocardiac density with obscuration of the left hemidiaphragm , given the clinical history is concerning for pneumonia . Presumed small left pleural effusion in present . Right lung is clear . No consolidation or pleural abnormality . Heart size , mediastinal and hilar contours are normal .
    OUTPUT:
    
Mildly increased retrocardiac density with obscuration of left hemidiaphragm is concerning for left lower lobe pneumonia and can be further assessed if lateral view could be obtained or with follow - up radiograph over next one - to - two days .