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The recurrent problem of the mediastinal mass is attested to by the voluminous literature on the subject. Because the mediastinum is not readily accessible, differential diagnosis has been the overriding concern of most authors. Schlumberger (1) presents perhaps the most comprehensive classification (table 1) of etiology, but includes no information on incidence. Darriel and associates (2) in their series of 81 cases, found 24 cysts, 18 neurogenic tumors, 8 thyroid tumors, 8 thymic tumors, 7 lymphomas, and 23 miscellaneous tumors. Heimburger and co-workers (3) reviewed ten large series to which they added their own 115 cases bringing the total to 1,331 cases. ' An analysis of this large series follows:
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Choy et al. (1967) studied this question.