We reported a case of thoracic localized, mixed variant, Castleman's Disease (angiofollicular lymph node hyperplasia) with a favourable clinical course presenting with mediastinal mass, microcytic anemia, mild thrombocytosis, polyclonal hypergammaglobulinaemia and without symptoms. Castleman's Disease must be always considered in the differential diagnosis of solitary mediastinal masses. Transthoracic fine needle aspiration cytology is usually nondiagnostic; in fact, cytologically, Castleman's Disease can be confused with other mediastinal lymphoproliferative disorders (such as thymomas or lymphomas). The optimal therapeutic approach is unknown but a complete surgical resection is treatment of choice for localized disease.
