Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior chest radiograph from ___ , there has been interval removal of a right - sided pigtail catheter . Miniscule collection of right apical air is identified . There are no pleural effusions . Cardiomediastinal and hilar contours are within normal limits . There is calicifaction of the mitral annulus . Fiducial markers are again noted .
    OUTPUT:
    
Miniscule collection of right apical air .