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Examples of complex patent foramen ovale (PFO) by transoesophageal (TEE): a) Bicaval view (90°): The white arrows show the excessive thickening of septum secundum; b) (77° and 49°) a PFO with a large shunt; c) a large (1.4 cm) opening of a PFO toward the right atrium; d) bicaval view (89°), the yellow arrow shows a redundant Eustachian valve in the right atrium
