Pseudo-thrombus mechanism in left atrial appendage visualized via transthoracic echocardiography

[...]pericardial fluid was observed around the LAA (yellow arrow), causing it to collapse. [...]the pectinate muscle in the LAA was clearly observed by the pericardial fluid (yellow arrowhead), which visually resembled a thrombus on TTE The patient responded well to diuretics and antibiotics. Declarations Conflict of interest Ai Saito, Toshimitsu Kato, Takahiro Ikoma, Katsuhiko Tsunekawa, Noriaki Takama, Takao Kimura, and Masami Murakami declare that they have no conflicts of interest. The left atrial appendage, a small, blind-ended structure: a review of its echocardiographic evaluation and its clinical role.