Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 04 :54 is submitted .
    OUTPUT:
    
Tracheostomy tube , bilateral internal jugular central lines , and feeding tube are likely unchanged , although the tip of the feeding tube is not identified on the current study . Lung volumes remain markedly diminished with crowding of the vasculature . Patchy opacity at both lung bases , left greater than right , favoring atelectasis , although superimposed pneumonia can not be excluded .