Change on chest CT findings of "primary infection of pulmonary Mycobacterium avium complex"

We reviewed the chest CT findings of 15 patients with "primary infection of Mycobacterium avium complex". All of them were female and the average age of them was 64.9 years old. They received no or only insufficient therapy. Comparing the chest CT findings followed up for the average of 60.9 months interval, only three patients showed clear progression. All of the cases with less than three lobes involved at the onset unchanged or improved. On the radiographic features at the onset, small nodulousor infiltrative shadows were seen in all patients, and bronchiectasis in three patients. Cavity was not seen. The lesions of 12 patients were located in the right upper lobe, 13 patients in the right middle lobe and 14 patients in the left lingula. Mild and limited cases may have potential with no or very slow progression, and case by case selective treatment should be considered.