”Mycobacterium avium complex” (MAC) infection often occurs in patients with pre-existing pulmonary disease or in those with an immunocompromised status. The classic radiographic features of pulmonary MAC are pleural thickening, bronchiectasis, centrilobular nodules and cavities. A lung mass-like lesion is rarely seen in pulmonary MAC. Herein, we report a rare case of a patient without chronic lung disease or immunosuppression, presenting with a lung mass and anemia, and with the final diagnosis of pulmonary MAC with bone marrow involvement.