Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs were obtained . Large right pleural effusion is unchanged . Linear density along the right apex with medial lucency is equivocal for possible pneumothorax ; particularly as no prior studies have demonstrated the presence of an azygos fissure . The left lung is largely clear . The portions of the cardiomediastinal contour the can be assessed appear unremarkable ; although the right mediastinal border is poorly evaluated due to presence of large effusion .
    OUTPUT:
    
Right apical pneumothorax can not be excluded and if indicated , this can be assessed by CT chest or followed with radiographs . Findings were discussed with Dr . ___ by Dr . ___ at ___ on ___ by phone .