Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An area of heterogeneous opacity in the posteroinferior aspect of the left lower lobe , better seen on the lateral view , suggests pneumonia . There is no effusion or pneumothorax . There is no vascular engorgement or pulmonary edema . Mediastinal and hilar contours are normal . Heart size is normal .
    OUTPUT:
    
Probable left lower lobe pneumonia . Recommend follow - up chest radiograph in ___ weeks following antibiotic therapy to assess for resolution .