Ruiz Mar, Gabriela Retroperitoneal fibrosis associated with immunoglobulin IgG4-related disease in the differential diagnosis in retroperitoneal tumors. Case report. [electronic resource] - Reumatologia clinica - e27-e29 p. digital Publication Type: Case Reports; Journal Article ISSN: 2173-5743 Standard No.: 10.1016/j.reuma.2017.06.008 doi Subjects--Topical Terms: Diagnosis, DifferentialFemaleHumansImmunoglobulin G--analysisImmunoglobulin G4-Related Disease--complicationsKi-67 Antigen--analysisMiddle AgedRetroperitoneal Fibrosis--complicationsRetroperitoneal Neoplasms--diagnosis