Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There diffuse bilateral opacities and prominence of the interstitial markings . Some areas of more patchy opacity are noted at the left base . No pleural effusion or septal lines . Heart size is within normal limits . No mediastinal masses are appreciated . There is degenerative change of the thoracic spine . No pneumothorax .
    OUTPUT:
    
Diffuse bilateral opacities . Diffuse atypical pneumonia is favored ; pulmonary edema could cause a similar appearance but is felt less likely given lack of pleural effusions . Followup radiography after treatment is required to ensure resolution of these findings .