Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube and enteric tube have been removed . Right internal jugular catheter terminates in the mid SVC . Sternotomy wires are intact . The heart is minimally enlarged from the prior exam . The mediastinum is also minimally widened which may reflect a postoperative appearance and recent extubation . Lung volumes are markedly low . Left basal opacity suggests atelectasis . There is no pleural effusion or appreciable pneumothorax . Mild vascular congestion without edema .
    OUTPUT:
    
Markedly low lung volumes . Widened mediastinum is most likely related to recent procedure and recent extubation / removal of positive pressure ventilatory support . There is no pneumothorax .