Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . There is a persistent opacity at the right mid to lower hemi thorax now with a pigtail drain in place . Given that the opacity persists , a mass is difficult to exclude and for this reason a CT is recommended to further assess . Mild pulmonary edema is new from prior exam . A tiny left effusion persists .
    OUTPUT:
    
Persistent opacity at the right mid to lower lung status post chest tube placement . Recommend CT to further assess . Interval development of mild pulmonary edema . Stable trace left effusion .