Ascending Vertical Vein Aneurysm.

We report a case of a 27-year-old female with supracardiac total anomalous pulmonary venous connection, where computed tomography angiography demonstrated a thin eccentric membranous web at the junction of the common chamber and ascending vertical vein with aneurysmal dilatation of the vertical vein distal to it. The development of the vertical vein aneurysm could possibly be attributed to the presence of turbulent flow within the vertical vein, distal to the site of stenosis caused by the membranous web.