Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right PICC tip sits at the lower SVC . The heart size is within normal limits . The mediastinal and hilar contours appear unremarkable . The patient is rotated to the right . The lung volumes are low but clear of lobar consolidation . Minimal retrocardiac atelectasis is present . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
Minimal retrocardiac atelectasis , but no definite evidence of pneumonia .