Fig. 9. UIP score defined by CT findings with emphasis on the presence and extent of traction bronchiectasis/bronchiolectasis (Hatabu and Lee as defined in Table 6).

A. UIP score = 0; non-subpleural ILA, TBI = 0, inconsistent for UIP. B. UIP score = 1; subpleural non-fibrotic ILA, TBI = 0, indeterminate UIP. C. UIP score = 2; subpleural non-fibrotic ILA, TBI = 1, indeterminate UIP. D. UIP score = 3; subpleural fibrotic ILA, TBI = 2, probable UIP. E. UIP score = 4; subpleural fibrotic ILA, TBI = 3, typical UIP. ILA = interstitial lung abnormalities, TBI = traction bronchiectasis index, UIP = usual interstitial pneumonia