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 examination 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.