Here is an article about a pulmonary cryptococcosis, a fungal infection, mimicking a metastasis in a patient with sarcoma:
If you take a look at google images of pulmonary cryptococcosis, it does looks similar to malignant nodules and apparently it even gets picked up by PET scans.
Oh how awful, Elodie. You have a very serious disease, and then they find what they think is evidence of its spreading, only to find after surgery that it’s a bug. What a trial.
Seenie