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Abstract
Among 394 necropsied cases with all kinds of congenital cardiac anomalies, 7 cases were tricuspid atresias which are reviewed in a separate paper. Five cases were registered as congenital tricuspid stenoses. These cases, together with an additional sixth case, are discussed in the present paper, mainly taking the anatomical findings into consideration. They represent an indistinct and rather heterogeneous group within the field of cardiac anomalies, which is not generally accepted. In the opinion of the author, this group cannot be omitted in a general survey on congenital heart diseases. It is necessary, however, to distinguish between a rather distinct valvular and a more questionable annular stenosis. In the former, the cusps are fused together forming a membrane with varying aperture. Three of the present cases belong to this type, and one of them is classified as isolated (pure) congenital tricuspid stenosis. The annular stenosis is mainly characterized by a narrow valve ring, and is usually associated with pulmonary stenosis or atresia including a small right ventricle. The true nature and the functional importance of the annular tricuspid stenosis is, in the opinion of the author, still an unsolved problem which deserves further investigation.