Nonobstructive membranes of the left atrial appendage cavity: report of three cases.
Bakris N, Tighe DA, Rousou JA, Hiser WL, Flack JE, Engelman RM. Nonobstructive membranes of the left atrial appendage cavity: report of three cases. J Am Soc Echocardiogr. 2002 Mar; 15(3):267-70.