Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright radiograph of the chest demonstrates clear lungs and normal hilar and cardiomediastinal contours . The left apex can not be assessed due to the head positioning . A horizontal line projecting over the left lower lung likely represents overlying soft tissues . There is no pneumothorax .
    OUTPUT:
    
No evidence of pneumonia or aspiration .