Usual interstitial pneumonia (UIP) is one type of idiopathic interstitial pneumonia, characterized by its poor prognosis and gradual deterioration of clinical course. So it is important to distinguish UIP from other interstitial pneumonia. Defi nitive histological diagnosis of UIP requires lung biopsy. The criteria for diagnosis of UIP in the absence of a surgical lung biopsy were recently defi ned. We report a case of 75-year-old man who was diagnosed as bronchopneumonia with chief complaint of fever, dyspnea on fi rst visit, then fi nally diagnosed as UIP through the remaining of chest abnormality after treatment.
