Fig. 10

HRCT features of NSIP. NSIP patterns are shown in a 52-year-old woman (A) and in a 75-year-old woman (B). Bilateral patchy ground-glass areas, predominantly located in the middle and lower areas, represent the most important HRCT feature of NSIP. However, when the ground-glass area is not extensively distributed through the lungs, the differential diagnosis from the UIP pattern remains very difficult. Subpleural areas not involved by ground-glass opacifications (black arrows) have been suggested as other CT features helpful for diagnosis [30]