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Castleman''s disease is a rare form of lymph node hyperplasia most commonly presenting as a solitary hypervascular mediastinal mass. Surgical resection is the treatment of choice, but this can be associated with significant blood loss due to its hypervascularity. We report two cases with a preoperative diagnosis of mediastinal Castleman''s disease in whom preoperative embolization with Trisacryl gelatin microspheres (Biosphere Medical, Rockland, MA) was performed. Compared with the literature, a decrease in the amount of perioperative bleeding was noted in both cases. [Copyright &y& Elsevier]