Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a confluent opacity in the right upper lobe with a relative rounded lucency measuring 4 .0 x 3 .2 cm . There are increased interstitial markings of that right lower lobe . The left lung appears mostly clear . There is mild shift of the mediastinum to the left , though it may be rotational .
    OUTPUT:
    
Confluent right upper lobe opacity with a relative rounded lucency measuring 4 .0 x 3 .2 cm , worrisome for cavitation .