“…According to previous reports, the characteristic presentation of intrathoracic MAC infection in immunocompetent children is as follows: equal sex distribution, presented aged at 3 years or less, without exposure to Mycobacterium tuberculosis . Each had clinical and radiographic findings of intrinsic and/or extrinsic bronchial compression 3–5 . In our patient, enlargement of an infected esophageal duplication cyst may have obstructed the right upper bronchus and led to MAC infection of the right upper lobe.…”