Summary.Three new cases of pericardial agenesis are reported: two cases of partial agenesis and one of total agenesis. All three cases were operated (resection of the left atrium).Following description of their cases, the authors provide an historical perspective of this disorder and analyse its frequency. A consideration of the embryology of the region explains why left sided agenesis is by far the more frequent. Finally, they discuss the appropriate diagnostic approach and suitable treatment, comparing total agenesis which is usually well tolerated with partial agenesis which exposes the patient to the risk of atrial herniation and occasionally sudden death. Bases anatomiques du traitement des ag6n6sies du p6ricarde gauche. A propos de trois observationsR6sum6. Trois nouvelles observations d'ag6n6sie du p6ricarde sont rapport6es: 2 cas d'ag6n6sie partielle, 1 cas d'ag6n~sie totale. Ces trois malades ont 6t6 op6-r6s (r6section de l'auricule gauche).Les auteurs envisagent ensuite l'historique et la fr6quence de cette anomalie, puis l'embryologie qui explique la plus grande fr6quence des aplasies du p6ricarde gauche. Enfin ils envisagent les circonstances diagnostiques et la conduite th6rapeutique, en opposant les formes globales, parfaitement tol6r6es, aux formes partielles (foramen p6ricardique), qui exposent au risque d'incarcSration de l'auricule gauche avec parfois mort subite.
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