case_images: PMC5791505_01
case_images: Mass in the left atrium appendage
case_images: ACA-21-97-g001.jpg
case_images: PMC5791505_01_ACA-21-97-g001.jpg
case_images: F1
case_images: TEE examination an echo dense, round mass was identified in the center of left atrial appendage (LAA) in midesophageal four-chamber view at an angle of 36  [Figure 1 and Video 1].
case_images: Left atrial appendage bridging mass with its attachments to left atrial appendage walls
case_images: ACA-21-97-g002.jpg
case_images: PMC5791505_01_ACA-21-97-g002.jpg
case_images: F2
case_images: During this examination, the mass was visualized with its attachment to both the walls of LAA [Figures 2 and 3], and it was identified as hypertrophied pectinate muscle bridging across the LAA cavity.
case_images: Elongated mass with definite connection with left atrial appendage wall on both sides across the cavity of left atrial appendage
case_images: ACA-21-97-g003.jpg
case_images: PMC5791505_01_ACA-21-97-g003.jpg
case_images: F3
case_images: During this examination, the mass was visualized with its attachment to both the walls of LAA [Figures 2 and 3], and it was identified as hypertrophied pectinate muscle bridging across the LAA cavity.