[Isolated retroperitoneal Castleman's disease].

Castleman's disease is a rare disorder characterized by proliferation of the lymphoid tissue. Castleman's disease affects both males and females, and may occur at any age. Little is known about how often Castleman's disease actually occurs, other than it is rare, or what causes the disease. The most frequent location of the disease is the mediastinum. The location of the disease in the retroperitoneum is rare and it is usually associated with the generalized form of the disease. We report a case of a 34-year old man with isolated retroperitoneum Castleman's disease of the hyaline-vascular type, which presented as a palpable abdominal mass. The final diagnosis was reached after exploratory laparotomy and resection of the tumor.