**1. Introduction**

470 Aneurysm

[23] Merport M, Murphy TP, Egglin TK, Dubel GJ (2000) Fibrin sheath stripping versus catheter exchange for the treatment of failed tunneled hemodialysis catheters:

[24] Ash SA, Mankus RA, Sutton M (2000) Concentrated Sodium Citrate (23%) for Catheter

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randomized clinical trial.J. vasc. interv. radiol. 11: 1115–1120.

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Lock. Hemodialysis int. 4: 22-31.

Nephrol. dial. transplant. 17:2189-2195.

ASA is a rare entity incidentally diagnosed during conventional transthoracic echocardiography (TTE). It is defined as the presence of redundant and mobile interatrial septal tissue extending to at least 15 mm during the cardiorespiratory cycle. The incidence of ASA has been reported at about 2% in patients undergoing TTE [1]. Patent foramen ovale (PFO) and ASA have been cited as potential risk factors for cryptogenic stroke. For example, ASA was observed in 7.9% of patients with a history of possible embolic stroke. Most patients with previous cerebral ischemic events and ASA also have an interatrial shunt, usually via PFO. Interatrial shunt has been reported in 56-78% of patients with ASA [2]. To our knowledge, there have been few reports of surgical intervention in ASA, for which the surgical indications are not yet defined. We describe herein two cases of surgical repair of giant ASA.
