“…Furthermore, because of some shortcomings in the current diagnostic criteria, one must thoroughly consider other disorders in the differential diagnosis. In our case of unexplained generalized lymphadenopathy, fatigue, and night sweats, the differential diagnosis included various infections (EBV, CMV, toxoplasmosis, HIV, and mycobacterium), lymphoma/leukemia, metastatic neoplasia, systemic lupus erythematous, Castleman's disease, autoimmune lymphoproliferative syndrome, and Sjögren's syndrome [ 8 ]. However, with a thorough evaluation to exclude alternative diagnoses, in the setting of our patient's elevated serum IgG level and significant staining for IgG4, her diagnosis was established.…”