CTICasesDisseminated Mycobacterium avium Complex (MAC) Infection (Pulmonary and Sinus)
Imaging findings
Chest CT demonstrates clusters of small nodules, some exhibiting a tree-in-bud pattern, predominantly in the lower and middle lobes and lingula, accompanied by some volume loss, consistent with chronic MAC infection. A sinus CT reveals a nasal mass on the left, filling the sinus, which on biopsy showed granulomatous inflammation and cultured MAC.
Key takeaways
Mycobacterium avium complex (MAC) infection can present with disseminated involvement, including pulmonary nodules with tree-in-bud patterns and granulomatous masses in the sinuses. Treatment can lead to resolution of findings.
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