[IGG4-related disease. Report of 52 patients].

Background: IgG4-related disease (IgG4 RD) is an immune-mediated fibro-inflammatory disorder, with tissue infiltration of IgG4+ plasma cells. It causes pseudotumors, tumors, and a wide spectrum of clinical manifestations.

Aim: To report the clinical, laboratory, histopathological and treatment characteristics of a group of Chilean patients with IgG4 RD.

[Lymphadenopathies in patients with rheumatic diseases. Review of 19 cases].

Background: The presence of multiple lymphadenopathies can be a diagnostic challenge.

Aim: To describe the clinical, laboratory and imaging characteristics of 19 patients with lymphadenopathies of rheumatologic origin.

Material And Methods: Review of medical records of 19 patients aged 16 to 72 years (68%) with lymphadenopathies presumably secondary to a rheumatic disease.

[Oligoarthritis, panniculitis and pyoderma gangrenosum associated with non-Hodgkin lymphoma. Report of one case].

An assortment of clinical and laboratory abnormalities may occur as paraneoplastic syndromes in lymphomas. Rheumatological and dermatological manifestations such as paraneoplastic arthritis and pyoderma gangrenosum must be underscored. We report a 28 years old woman who developed pyoderma gangrenosum and two years later presented with arthritis of knees and ankles associated with panniculitis interpreted as erythema induratum that was pathologically confirmed.