Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are vague opacities in the bilateral lower lobes , which correspond to the ground - glass opacities and intralobular septal thickening seen in the imaged portion of the lower lung on the prior CT . The lungs are otherwise clear . Aside from mild cardiomegaly , the hilar and cardiomediastinal contours are normal . There is no pneumothorax . There is no pleural effusion . There is no significant pulmonary vascular engorgement .
    OUTPUT:
    
Vague bilateral lower lobe opacities , corresponding to ground - glass opacity and interlobular septal thickening seen on the CT , may represent pulmonary edema , however is the lack of vascular engorgement or pleural effusion is somewhat unusual . Atypical pneumonia should also be considered .