Owen J P, Urquhart W
Br J Radiol. 1979 Nov;52(623):855-61. doi: 10.1259/0007-1285-52-623-855.
A notch in the inferior border of the left atrium has been observed in patients with a persistent left superior vena cava draining via the coronary sinus into the right atrium. It is suggested that the notch is due to the dilated coronary sinus.