Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly has been stable compared to exams dated back to at least ___ . There is increased mild pulmonary vascular congestion , otherwise the hilar and mediastinal contours are unremarkable . There has been an interval increase in diffuse interstitial markings throughout the lungs bilaterally , as well as new small bilateral pleural effusions . There is no evidence of pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Diffuse bilateral interstitial opacities , very likely secondary to increased pulmonary edema from congestive heart failure , on a background of patient 's known chronic interstitial lung disease . Short term follow up radiographs after diuresis is recommended to ensure resolution and to exclude other process such as atypical pneumonia or acute exacerbation of interstitial lung disease .