<unk>  <unk> , also known as hyper-IgG4 disease and<unk><unk>  disease is a disease in which inflammatory cells cause fibrosis, the deposition of connective tissue, in one or more organs. The disease is so named because the antibody subtype<unk>  can be detected on tissue samples and often at elevated levels in the bloodstream. The association with<unk>  is a relatively recent finding, and the condition has been described under numerous other names in the past. Diseases such as autoimmune pancreatitis,  retroperitoneal fibrosis, mediastinal fibrosis, Riedel's thyroiditis, Mikulicz's syndrome, Kuttner's tumor and inflammatory pseudotumor are now regarded as forms of<unk> .
IgG4-related systemic disease
ANCA associated vasculitis
Lymphomatoid granulomatosis pathophysiology
Hyper-IgE syndrome
Nodal marginal zone lymphoma
Adult-onset Still's disease pathophysiology
Undifferentiated connective tissue disease
Post transplant lymphoproliferative disorder