[Retroperitoneal Castleman's disease. Presentation of a clinical case].

Castelman disease (CD) is a rare lymphadenopathy that usually presents as a solitary, slow growing mass; its etiology is still unknown. The authors described a case of CD localized in the retro-pancreatic space. A 33-year old patient, female, underwent abdominal ultrasonography because of upper right abdominal pain. The ultrasound showed gallbladder stones and a mass of 4 cm in diameter behind the pancreatic head, modifying the shape of the inferior vena cava. The patient underwent surgical excision and histological examination showed a hyaline type of CD. In the 70\% of the cases, the disease is located in the mediastinum, only in 14\% of the cases in the retroperitoneal space. The case we report is a hyaline type of CD that is the most frequent histological type, constitutes 90\% of the cases, occurs usually in the young population and after surgical excision has a very good prognosis. Different is the clinical behaviour of the plasma cell type of CD that has an aggressive and often fatal clinical outcome. The patient we treated is still free of any symptoms one year after the operation.