Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . Although much less than before , there is thickening , probably slight fluid within the minor fissure , although generalized pulmonary edema has resolved . There is a patchy opacity projecting over the lower thoracic spine which suggests pneumonia , hard to localized but more likely on the left than right , noting vague increased retrocardiac opacity .
    OUTPUT:
    
Posterior opacity suspicious for pneumonia . Followup radiographs , preferably with standard PA and lateral technique if possible , are recommended to assess further when clinically appropriate . Although it is difficult to tell for certain which side the opacity relates to , and it is probably more likely on the left noting vague increased retrocardiac shadowing .