Anomalous ridge on the left atrial side of the atrial septum

Ridges and Pouches: A Case Series of Anomalous Atrial Septal Fusion

“…Five of our cases as well as one previously reported case document a prominent ridge forming along the fossa ovalis. 3 In our case series, the majority of left atrial ridge findings occurred in the presence of a left atrial septal pouch. Recognition of the left atrial ridge is important so as to not mistake it for a mass, tumor, or cor triatriatum.…”

“…2 A left atrial ridge is a localized thickened area of tissue thought to be due to irregular fusion of the septa, typically running along the region of the fossa ovalis on the left atrial side of the septum. 3 As seen in this case series, some individuals may have a combination of an atrial septal pouch with an interatrial septal ridge (mixed anatomy). The presence of a left atrial ridge may have significant clinical implications for patients undergoing catheter-based procedures that require puncture of the interatrial septum, such as percutaneous mitral valve repair or replacement, atrial fibrillation ablation, or left atrial appendage closure.…”

Morphological Study of Fossa Ovalis in Formalin-Fixed Human Hearts and Its Clinical Importance

“…Regarding the presence of a prominent ridge along the FO, this was described with a prevalence of 18.7% in pig hearts, 15% in ovine hearts [14], and in humans by Shizukuda et al [15] in one case and by Zisa et al [16] in five human hearts on three-dimensional transesophageal echocardiography and may represent a challenge in the transseptal puncture. Zisa et al [16] discussed that these anomalous ridges of the left side of the interatrial septum may depend on an irregular fusion between the septum primum and the septum secundum and is different from a prominent rim of a PFO.…”

Papel do Ecocardiograma na Avaliação do Septo Interatrial e Pesquisa de Forame Oval Patente como Fonte Emboligênica

“…Entretanto, embora raramente, a proeminente formação em crista semelhante a membrana ao longo da FO e se estendendo até a parede livre atrial tem sido observada. 10 A crista septal atrial, caracterizada por estrutura tubular no lado atrial esquerdo do SIA, decorrendo ao longo da FO, é uma área de tecido espessada localizada e acredita-se que seja devido à fusão irregular dos septos ( Figura 6G-6I ). A presença de crista atrial esquerda pode potencialmente interferir na PTS em pacientes submetidos a procedimentos transcateter.…”