Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest obtained with patient in sitting semi-upright position . Analyzed in direct comparison with the next preceding similar study of ___ . Tracheostomy as before . Unchanged position of right - sided PICC line . The previously described bilateral basal densities persist and may even have increased . Diffuse haze over the bases suggests pleural effusions that probably are layering mostly in the posterior compartments as the patient is in semi-erect position only . No pneumothorax has developed .
    OUTPUT:
    
Persistent and somewhat increased bilateral parenchymal densities .