Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right middle lobe opacity obscures the cardiac border . The interstitial markings are diffusely prominent . There is no pleural effusion or pneumothorax . The cardiac and mediastinal contours are normal .
    OUTPUT:
    
Diffuse interstitial abnormality , more prominence in the right middle lobe pneumonia . Differential includes PCP and atypical infection .