Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiographs on ___ , there is small right apical pneumothorax . In retrospect , this may been present on previous radiograph , however was tiny if present at all . There is no evidence of tension . A previously seen right pleural effusion has resolved . Overall lung volumes are low , with bibasilar atelectasis . The right - sided chest tube is unchanged in position . Cardiomegaly is stable .
    OUTPUT:
    
Small right apical pneumothorax . Resolution of right pleural effusion .