Figure 1. .

Dependent GGO. Increased lung attenuation in subpleural and basal location in dependent areas may be favored by lack of inspiration (a). By using MIP, tortuous vessels in high attenuating areas are clearly identified, confirming the lack of deep inspiration (b). In another case of a 58-year-old patient presenting with shortness of breath, cough and hemoptoic sputum, supine acquisition shows bilateral GGOs in a posterobasal location with relative sparing of the immediate subpleural area suggestive of NSIP (c). This diagnosis is excluded by the reversibility of these dependent abnormalities in prone position (d). GGO, ground glass opacity; MIP, maximum intensityprojection; NSIP, non-specific interstitial pneumonia.