MRCP2-4638
A 56-year-old Caucasian teacher with RA started taking adalimumab three months ago and has seen significant improvement in joint symptoms. However, she has been experiencing a dry cough, weight loss, and fever for the past month, resulting in a 10 kg weight loss. She is also taking methotrexate and folic acid, and has no personal or family history of chronic illnesses. On examination, she has scattered crepitations in her respiratory system and cervical lymphadenopathy. Recent blood tests show elevated ESR and miliary shadows bilaterally on CXR. What is the most likely diagnosis?