Retroperitoneal Castleman’s disease: advocating a multidisciplinary approach for a rare clinical entity

BACKGROUND Castleman's disease is a rare and poorly understood disease entity that may resemble more common conditions and represents a clinical challenge to the treating surgeon. CASE PRESENTATION In this report, we describe a case of a 61-year-old Caucasian woman with a symptomatic retroperitoneal mass. The specimen obtained from her resection contained a protuberant encapsulated mass, exhibiting microscopic features consistent with localized, unicentric Castleman's disease. These characteristics included architectural features and immunohistochemical findings consistent with the hyaline vascular variant of Castleman's disease. CONCLUSION We report a very rare case of a retroperitoneal hyaline vascular type of Castleman's disease. We discuss the diagnostic dilemma Castleman's disease may present to the surgeon, with an emphasis on multidisciplinary management of these patients. We also review current data on pathogenesis, treatment and outcomes.