MRCP2-2669

A 65 year old man, originally from Russia, presents to the hospital with a right sided pleural effusion, night sweats, and weight loss. He is febrile on admission and his pleural effusion is exudative. A CT scan reveals enlarged lymph nodes in his abdomen and mediastinum. A pleural biopsy confirms Mycobacterium Tuberculosis complex and he is started on treatment. His HIV serology is positive and he is started on anti-retroviral treatment. Three weeks later, he becomes more unwell with daily fevers and abnormal blood results. What is the most likely diagnosis?