This definition appears very rarely
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Samples in periodicals archive:
Clinicoepidemiological features of pulmonary histiocytosis X.
Granulomatous diseases include pulmonary sarcoidosis (Figure 4) hypersensitivity pneumonitis (HP), Langerhans-cell histiocytosis (Figure 5, formerly known as pulmonary histiocytosis X or eosinophilic granuloma), and miliary infections caused by tuberculosis, cryptococcosis, coccidiomycosis, and histoplasmosis.