Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chronic elevation of the left hemidiaphragm is redemonstrated . There is mild interval increase of layering left pleural effusion . A small right pleural effusion is also present . Increased interstitial markings and upper vascular redistribution are seen . No convincing signs of pneumonia . Cardiac contour can not be assessed due to obscuration of the left heart border but appears stable . Sternotomy wires and mediastinal clips are redemonstrated . Degenerative changes of the right shoulder are also seen .
    OUTPUT:
    
Interstitial edema and increased left sided pleural effusion suggest heart failure .