Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tehcnically limited study due to semi upright positioning , relatively low lung volumes , and AP technique . No lobar consolidation . . Mediastinal contours , hila , and top - normal heart size are unchanged from ___ . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No lobar pneumonia , although technically limited study limits assessment for atypical or early pneumonia . If clinical suspicion for infection persists , repeat frontal radiograph with PA upright technique could be performed .