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Veno-venous bridges: the forerunners of the sinus venosus defect Butts RJ; Crean AM; Hlavacek AM; Spicer DE; Cook AC; Oechslin EN; Anderson RHCardiol Young 2011[Dec]; 21 (6): 623-30BACKGROUND: Differentiation of the so-called sinus venosus defect from other defects permitting shunting between the atrial chambers remains problematic. The lesion is not a true septal defect, and current theories to explain the existence of the sinus venosus defect fall short. The presence of persistent systemic to pulmonary venous connections has been proposed to explain the existence of the sinus venosus defect. METHODS: Clinical histories and radiological findings of six patients are reviewed. Three patients have veno-venous bridges, two have partial anomalous pulmonary venous connections, and one patient has a sinus venosus defect. The clinical information is reviewed, along with current developmental and morphological considerations. DISCUSSION: We provide radiographic, developmental, and morphological evidence to support the theory that a so-called sinus venosus defect is the consequence of persistence of foetal systemic to pulmonary veno-venous bridges, rather than of deficiencies in atrial septation.|Aged[MESH]|Child[MESH]|Child, Preschool[MESH]|Female[MESH]|Heart Septal Defects, Atrial/diagnostic imaging/*physiopathology[MESH]|Humans[MESH]|Infant[MESH]|Male[MESH]|Pulmonary Veins/*abnormalities/diagnostic imaging[MESH]|Tomography, X-Ray Computed[MESH]|Vena Cava, Superior/*abnormalities/diagnostic imaging[MESH] |
