Presentation
Third round breast screen
Patient Data
Age: 55 years
Gender: Female
From the case:
Bilateral sternalis muscle at mammography
{"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/24656/annotated_viewer_json?lang=us"}
Triangular opacities seen medially in both breasts represent the sternalis muscle. Only seen on the CC and Cleavage views
From the case:
Bilateral sternalis muscle at mammography
{"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/24657/annotated_viewer_json?lang=us"}
Normal appearance on the MLO
Case Discussion
Uncommon for bilateral sternalis muscles to be seen.
When bilateral as in this case, they are usually asymmetrical.