A case of IgG4-related disease seemingly presenting as a T-cell lymphoma

IgG4-related disease (IgG4-RD) is an immune-mediated disorder hallmarked with lymphoplasmacytic tissues infiltrated with abundant IgG4-positive plasma cells, which has various clinical features and easily to be misdiagnosed. Here, we described a case with symptoms of body weight loss and multiple lymph node enlargements in a patient’s groin, axilla, mediastinum, and retroperitoneum at the first admission. Both F-fluorodeoxyglucose (FDG)-position...