Figure 18.

Increased activity in an atypical mycobacterium infection (culture proven). A 70-year-old female with previous computed tomography (CT) changes of atypical mycobacterium underwent PET-CT for follow-up of surgically resected tonsillar squamous cell carcinoma. (A,B) Peripheral moderate increased FDG uptake (arrow) in a new right lung cavitary lesion with additional two new, tiny lung nodules showing mild increased tracer uptake (arrowhead). The differential diagnosis included metastatic disease, aspiration, and infection including atypical mycobacterium. A bronchoscopically obtained specimen grew atypical mycobacterium.