Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest radiograph . Single pacer leads in stable position . Left basilar opacity with obscuration of the left hemidiaphragm has worsened since ___ . Severe cardiomegaly is unchanged , but there is no interstitial edema . Bilateral pleural effusions are trace . There is no pneumothorax . Pneumoperitoneum is unchanged .
    OUTPUT:
    
Worsening left lower lobe pneumonia .