The traditional Castleman's Disease is characterized by the presence of a single tumor constituted by hyperplasic lymphoid tissue. It is usually asymptomatic and has a good prognosis. More recently, another disease which is histologically undistinguishable has been described. However, it courses with polyadenopathic signs, consumptive syndrome, anemia, hypergammaglobulemia and fever and has been called multicentric Castleman's Disease. A comprehensive review of national and international literature is included.