Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild interstitial abnormality in the setting of upper lobe vascular engorgement and top - normal heart size is most commonly due to mild pulmonary edema , but prior radiographs should be obtained to see if this is chronic lung disease instead . No pneumothorax or pleural effusion . Thoracic aorta is tortuous but not focally dilated . Vascular clips denote left axillary surgery , most commonly seen within the lymph node dissection for breast carcinoma , but conceivably some other diagnosis such as a vascular repair .
    OUTPUT:
    
Probable mild congestive heart failure .