RESUMEN
X-ray and clinical features of tuberculosis combined with lingering pneumonia were studied in 110 patients of the 7th group of dispensary registration suffering from chronic diseases of the respiratory organs. Tuberculosis recurrences in this group of patients had a torpid course, specific changes were slowly reversed, noticeable fibrosis was formed on their site. Thorough x-ray tomographic investigation not only of the pneumonia zone but also of the zone of posttubercular changes was conducted at the onset and end of pneumonia therapy to exclude tuberculosis reactivation. Frequent exacerbations of chronic diseases of the respiratory organs including complications in the form of lingering pneumonia in patients with posttubercular changes can mask early stages of tuberculosis reactivation.