In a minority of cases, foramen ovales (FOs) are difficult to access due to single confounding anatomical variations. However, there is no method reported where the FO has been successfully targeted via a single puncture in the presence of two or more anatomical variations.

中文翻译：

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三叉神经痛射频热凝的空对空会合技术：病例报告

在少数情况下，由于单一的混杂解剖变异，难以进入卵圆孔 (FO)。然而，没有报告在存在两个或多个解剖变异的情况下通过单次穿刺成功瞄准 FO 的方法。