A mass this size that was inaccessible by bronchoscopy is probably a peripheral mass. The starburst shape is worrisome for cancer but this could still be benign. The unresponsiveness to treatment for pneumonia provides no guidance as such a mass, if infectious, is more likely to be a fungal infection.
The PET scan can be positive for cancer, but not always. It can be positive for example, in sarcoid.
One can only speculate from imaging and a tissue diagnosis is absolutely necessary. If the mass is peripheral it could be accessible to needle biopsy or video assisted thoracoscopic surgery (VATS), thus avoiding a full thoracotomy, if it has not already been done. I would be most interested in what is found at surgery.
Good luck to this person.
NON-cancerous. She had surgery to remove it because it was affecting her breathing. Once she recovered from the surgery, she was back to her old self again.