Figure 11a. Comparison of high-resolution CT features between UIP and NSIP. (a) UIP is characterized by heterogeneous lung abnormalities consisting of subpleural honeycombing (arrowhead), reticular opacities, and traction bronchiectasis. (b) NSIP demonstrates homogeneous lung involvement with predominance of ground-glass opacity combined with sub-pleural linear opacities and micronodules. The microcysts in NSIP (arrowhead) are much smaller than the honeycombing in UIP.