Microscopically, lung tissue from patients shows a characteristic set of histologic/pathologic features known as usual interstitial pneumonia (UIP). UIP is therefore the pathologic counterpart of IPF.

The pattern seen in lung biopsy specimens of patients with IPF is the so-called "Usual Interstitial Pneumonia" or "UIP". Typical findings of UIP will include: 1. Temporally heterogeneous appearance at ...