title: [Practical problems of early diagnosis of primary malignant tumors of the lung].
mesh_terms: D000368:Aged; D001995:Bronchography; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D008875:Middle Aged; D013183:Sputum / Q000032:analysis; D013997:Time Factors
vernacular_title: Problemas prácticos del diagnóstico precóz de los tumores malígnos primitivos de pulmón.