Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are very low and unchanged ; left lower lobe is poorly aerated . Right lower lung atelectatic band has improved . The patient has been extubated since the previous exam . Right - sided PICC line is either in lower SVC or at cavoatrial junction . There is no pneumothorax or pleural effusion . Mediastinal and cardiac contours are top normal . Curvilinear increased density overlying left heart is possibly a calcified mitral annulus .
    OUTPUT:
    
There is no significant change since previous exam . 1 . The patient has been extubated . 2 . The lung volumes are very low .