- Presence of active interstitial alveolitis (presence of grade 2 exertional dyspnea according to Mahler Dyspnea Index AND worsening of lung function tests PLUS interstitial alveolitis assessed by HRCTscan, ground-glass pattern involving at least two lung segments OR dyspnea (as defined above)PLUS Interstitial alveolitis assessed by HRCTscan (AS DEFINED ABOVE) AND neutrophilic or eosinophilic alveolitis detected through broncoalveolar lavage