Balikesir, Turkey.

The images below show a case of the atrioventricular septal defect detected during a second trimester examination.

Images 1, 2: Four-chamber views of the heart showing atrioventricular septal defect. The image 1 shows a "Mercedes sign" typical for this anomaly.

Images 3, 4: Four-chamber views of the heart showing the atrioventricular septal defect.

Images 5, 6: Color Doppler and gray scale images showing the four-chamber views of the heart with atrioventricular septal defect.