Third mogul sign
Third mogul
sign • Moguls of the heart (illustration) - Ganzer Fall bei Radiopaedia
Third mogul
sign • Left atrial enlargement - Ganzer Fall bei Radiopaedia
Mitral valve
regurgitation • Mitral valve regurgitation - Ganzer Fall bei Radiopaedia
The third mogul sign can be seen on frontal chest radiograph in the presence of left atrial enlargement. It refers to an extra mogul or bump along the upper left cardiac silhouette just below the left main bronchus.
The third mogul sign commonly represents the enlarged left atrial appendage, particularly in patients with rheumatic heart disease. Other causes that may also appear as a third mogul on the cardiomediastinal contour include:
- cardiac aneurysm
- pericardial cyst
- coronary artery aneurysm
- mediastinal tumor
- pericardial defect
- sinus of Valsalva aneurysm
- dilated right ventricular outflow tract
