Figure legends
Figure 1. Preoperative imaging of arterial septal aneurysm.
Multi-slice computed tomography shows giant ASA is protruding into right
atrium and thrombus attached to left side of ASA pouch (A).
Transthoracic echocardiography shows ASA attached to right atrial free
wall and protruding into right atrium (B). ASA, atrial sepal aneurysm;
LA, left atrium; LV, left ventricle; RA, right atrium; RV, right
ventricle.
Figure 2. Intraoperative imaging findings.
Giant atrial sepal aneurysm protrudes into right atrium (A). Patent
foramen ovale (B). ASA, atrial sepal aneurysm; RA, right atrium
Figure 3. Pathological findings of atrial sepal aneurysm (ASA).
Bloodstained gauze was placed inside giant ASA to understand nature of
thin tissue. Mixture of thickened and very thin tissues that seemed
vulnerable to imminent tears (A). Histological section of thin ASA
tissues (B). Histological section of normal ASA tissues mixed with fatty
cell infiltration and fibrosis (C). Hematoxylin and eosin staining.
Magnification, ×100. ASA, atrial sepal aneurysm.