Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A massive left - sided pleural effusion appears minimally decreased in volume compared to ___ with persistent compression and collapse of most of the left lung . Now seen is a roughly 5 .6 cm cavitating lesion in the superior segment of the left lower lobe with air - fluid levels corresponding to patient 's known squamous cell carcinoma which demonstrated cavitation on PET - CT from ___ . The right lung is essentially clear . There is also a small right - sided pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Massive left - sided pleural effusion minimally decreased in volume as compared to prior examination with probable slight re-expansion of the left lower lung with redemonstration of a roughly 5 .6 cm cavitating lesion in the superior segment of the left lower lobe corresponding to patient 's known SCC .