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Updated: Mar 24, 2026

Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
Published on: February 26, 2013
Calcified amorphous tumor of the left atrial appendage
Yusuke Watanabe1, Toru Naganuma1, Tatsuya Nakao2
1Department of Cardiology, New Tokyo Hospital, Chiba, Japan; Interventional Cardiology Unit, New Tokyo Hospital, Chiba, Japan.
Abstract:
A 57-year-old female with end-stage renal dysfunction was admitted to our hospital. The echocardiogram revealed a 9mm×22mm hyperechoic mass in the left atrial appendage (LAA). The mass was extremely mobile. Considering the high risk of embolic events, we decided on a surgical resection. Microscopic examination of the mass revealed a nodular focus of calcification and fibrosis with focal chronic inflammation of the atrial endocardium. The endocardium was uniformly thickened with no evidence of neoplastic proliferation. The mass was diagnosed with a calcified amorphous tumor (CAT). This is first report of CAT of the LAA.
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