Retroperitoneal Unicentric Castleman's disease, a case report

Introduction: Castleman's disease (CD) is an unusual nonmalignant lymphoproliferative disorder which presented with enlarged hyperplastic lymphoid tissue and had three subtypes, hyaline-vascular, plasma cell, and mixed form according to histologic findings.Case report: We report a 31-year-old woman who presented with abdominal pain from 3 months ago. Imaging studies showed a well-defined mass on back of pancreas without any invasion. The histopathological examina-tion revealed lymphoid tissue with prominent vascular proliferation and hyalinization of the vessel walls compatible with Hyaline vascular CD. So, pathological assessment is essential for the diagnosis.Conclusion: Unicentric CD must be considered as differential diagnosis in a solid solitary abdominal mass. In patients with abdominal mass of an ambiguous nature, surgical resection is necessary as diagnostic tool and the first treatment approach.