Localized retroperitoneal mass suspected malignancy: A rare case of unicentric Castleman's disease

Castleman's Disease is a heterogeneous group of lymphoproliferative disorders, that can develop in lymph nodes or in extranodal sites. It has three distinct his-tological subtypes; hyaline vascular, plasma cell or mixed. It can be unicentric or multicentric, and sometimes oligocentric or regional. In this article, we report a case of a 30- year- old male who presented with a palpable left lumbar mass, clinically suspected as sarcoma vs GIST, which was surgically excised and path-ologically examined revealing a rare condition of intra- abdominal unicentric Castleman's Disease with good prognosis. Castleman's Disease should be consid-ered in the differential diagnosis of retroperitoneal masses, especially in equivo-cal cases.