Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-upright portable AP view of the chest are provided . Overlying EKG wires somewhat limit the evaluation . There is subtle ground - glass nodularity in the lower lungs which could reflect pneumonia . Overall , this appearance has not significantly changed from prior . The upper lungs remain well aerated . No effusion . Cardiomediastinal silhouette is normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Subtle nodularity in the lower lungs , unchanged , could represent pneumonia .