A 32-year-old male underwent a lung transplant 1 year ago. Initially, he had an episode of acute rejection requiring increased immunosuppression. He now presents with symptoms of low-grade fever and generalized fatigue, fever, and weight loss. Chest x-rays are obtained.The most likely diagnosis of this patient is
Posttransplant lymphomatoid disorder (PTLD) Squamous cell carcinoma Aspergilloma Phantom tumor or pseudotumor