Correct!
3. Lymphangioleiomyomatosis
Lymphangioleiomyomatosis is the least likely etiology for the patient’s imaging findings- the CT findings are largely non-cystic and are essentially unilateral in distribution, and both of these features are highly atypical for the diagnosis of lymphangioleiomyomatosis. The unilateral nature of the abnormalities on the imaging studies is also atypical for sarcoidosis, but the findings of interstitial and septal infiltration and abnormal peribronchial and mediastinal soft tissue are commonly seen in that disorder. The abnormal soft tissue in the peribronchial and mediastinal regions and the interlobular septal thickening are very common abnormalities at thoracic imaging studies in patients with fibrosing mediastinitis, metastatic malignancy, and bronchogenic malignancy.
The patient subsequently underwent 18FDG-PET scan (Figure 3).
Figure 3. Axial 18FDG-PET scan.
Which of the following statements regarding this imaging study is most accurate? (Click on the correct answer to proceed to the eighth of nine pages)