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A patient with amyopathic dermatomyositis associated with fatal rapidly progressive interstitial pneumonitis resistant to therapy is described. Pathologic examination of a transbronchial lung biopsy specimen showed diffuse alveolar damage and nonspecific interstitial pneumonia-organizing pneumonia-like findings. Bronchoalveolar lavage fluid contained many CD8+ lymphocytes, considered to be cytotoxic T cells. Analysis of bronchoalveolar lavage fluid in this case may provide prognostically and pathogenetically important information.