Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable radiograph of the chest demonstrates a patient rotated toward his left . Low lung volumes are seen . Sternotomy wires are intact . Patient is status post valvular repair . The heart is stably enlarged . Bilateral opacification diaphragms may reflect atelectasis though infection can not be excluded . Obscuration of bilateral costophrenic angles likely reflects pulmonary effusions . Unchanged since most recent study , there are patchy parenchymal opacities bilaterally . In a patient with known heart failure , this likely reflects pulmonary edema .
    OUTPUT:
    
Patchy bilateral opacities with small pleural effusions . In a patient with cardiomegaly , this is thought to reflect mild pulmonary edema . Obscuration of bilateral diaphragms likely reflects a component of atelectasis , though pneumonia can not be excluded .