unusual left lateral peripheral interstitial opacity. this could be pleural-based scarring or other pleural-based abnormality or peripheral interstitial abnormality. while infection is not completely excluded, this is an unusual appearance for a typical pneumonia. recommend a ct of the chest with contrast for further characterization. results were emailed to the ed qa nurses on <unk> by dr. <unk>, as the patient had been discharged by the time the findings were communicated with the ed resident.