From the case:
Left atrial enlargement on chest radiography (illustration)
{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_examine_pipeline_reports":false,"can_pin":false},"extraPropsURL":"/studies/50900/annotated_viewer_json?iframe=true\u0026lang=us"}
The following are the radiologic signs of left atrial enlargement on frontal chest radiographs:
- double density sign
- distance of the right border of the left atrium from the midpoint of the left mainstem bronchus is more than 7 cm
- enlarged left atrial appendage (third mogul sign)
- uplifted left mainstem bronchus
- widening of the carinal angle (more than 90 degrees)
- atrial escape (the right border of the markedly enlarged left atrium goes beyond the right atrial margin)
From the case:
Left atrial enlargement on chest radiography (illustration)
{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_examine_pipeline_reports":false,"can_pin":false},"extraPropsURL":"/studies/50906/annotated_viewer_json?iframe=true\u0026lang=us"}
On lateral chest radiographs, an enlarged left atrium results to:
- prominence of the upper posterior cardiac convexity
- posterior displacement of the left mainstem bronchus (walking man sign)