[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.

[IgG4 associated nephritis and recurrent hemoptysis: Case report].

IgG4 disease is a multi-systemic condition involving pancreas, salivary glands and lymph nodes. Less frequently, it causes interstitial nephritis and involves the lungs. We report a 58 years old male with a four years history of hemoptysis and renal dysfunction characterized by hematuria and proteinuria, responsive to steroidal therapy.

Polyarthritis and membranoproliferative glomerulonephritis as paraneoplastic manifestation of Hodgkin's lymphoma: A case report and literature review.

Paraneoplastic syndromes can be presented in multiple ways, which include endocrinological, hematologic, rheumatologic and nephrologic manifestations. While most of the publications described solid tumors as responsible for these manifestations, hematologic neoplasms are important cause to consider as part of the differential diagnosis. We report the case of a 46 year-old man with seronegative symmetric polyarthritis of large and small joints associated with membranoproliferative glomerulonephritis with deposits of immune complexes and acute impairment of renal function, as part of a paraneoplastic syndrome secondary of a classical Hodgkin lymphoma with bone marrow invasion, which reversed completely with chemotherapy treatment.

[Pulmonary artery sarcoma mimicking a Hughes Stovin syndrome. Report of one case].

Pulmonary artery sarcoma is an uncommon entity with high mortality. Its clinical presentation is usually indistinguishable from pulmonary embolism, which leads to a significant delay in diagnosis. Hughes-Stovin syndrome is characterized by venous thrombosis and aneurysms of the pulmonary or bronchial artery.

[IgG4-related disease, the new "great mimicker": report of one case].

Due to its multisystem involvement, IgG4 -related disease should be considered in the differential diagnosis of medical conditions such as lymphadenopathies, aortitis, serositis and retroperitoneal fibrosis. It shares features with other entities historically described as "great mimickers" such as syphilis, tuberculosis, sarcoidosis, and systemic lupus erythematosus. We report a 40 year-old male with recurrent effusive - constrictive pericarditis, lymphadenopathy and aortitis.

[Pneumorrhachis, spondylitis and meningitis secondary to emphysematous cystitis. Report of one case].

We report a 57-year-old woman who presented with low back pain, fever and impairment of consciousness. The patient was admitted to the intensive care unit in Glasgow 8, with neck stiffness, peritoneal irritation, leukocytosis, hyperglycemia requiring insulin and a urine test suspecting an infection. Brain CT was unremarkable, while CT of the abdomen and pelvis evidenced emphysematous cystitis, retropneumoperitoneum and pneumorrhachis.