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Purpose: To compare initial CT findings of non-tuberculous mycobacteria (NTM) pulmonary infection between stable and progressed groups and determine whether they could be used to predict disease prognosis and treatment response. Materials and Methods: From July 2006 to October 2013, 71 patients with NTM infection were retrospectively reviewed. Lung lesion pattern of CT finding, specific species, disease duration, and follow-up period were analyzed. These patients were classified into NTM stable (n = 46) and progressed (n = 25) groups. Results: The most common CT findings of NTM infection were small nodules (n = 71, 100%) and bronchiectasis (n = 67, 94%). Large consolidation (> 2 cm, n = 34, 48%) and involvement of more than four lobes (n = 49, 69%) were also commonly observed. According to disease prognosis, large consolidation (n = 18, 72%, p = 0.003), cavitary lesion (n = 17, p = 0.002), and involvement of four or more lobes (n = 21, p = 0.044) on CT were significantly more frequent in disease progressed group than that in the stable group. Conclusion: Among common CT findings of NTM disease, some CT findings such as large consolidation, cavitary lesion, and disease extent are good predictors of response to treatment in NTM pulmonary disease. Index terms Lung Nontuberculous Mycobacteria Computed Tomography, X-ray

Comparison of CT Findings of Non-Tuberculous Mycobacterial Pulmonary Infection: Disease Stable versus Progressed Group