Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph ___ at 10 :31 is submitted .
    OUTPUT:
    
There is persistent small to moderate right pleural effusion with some associated patchy airspace to disease at the right base likely reflecting atelectasis . A right apical lucency raises the possibility of a tiny right apical pneumothorax , although the patient reportedly has not had recent thoracentesis . Clinical correlation is recommended and follow up imaging may be helpful . Lung volumes are low . Interval improvement but residual mild perihilar edema . Stable cardiac and mediastinal contours .