CT and FDG PET of a pulmonary infarct from embolism

Chest CT without contrast (A) and FDG PET images (B) show a cavitating nodule (arrow) and subsegmental air space opacity (arrowhead) in the right lower lobe. Both are mildly FDG-avid with an indeterminate SUV of 2.1. Pathology of the nodule showed subacute infarction resulting from pulmonary embolism. The subsegmental air space opacity could represent another infarct or inflammation.