Presentation
Incidental finding.
Patient Data
Age: 60 years
Gender: Female
From the case:
Sternalis muscle
{"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/110090/annotated_viewer_json?c=1669501275\u0026lang=us"}



Sternalis muscle (red arrow) - thin vertical muscle band in the anterior chest wall, superficially to the right major pectoralis muscle.
From the case:
Sternalis muscle
{"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/110250/annotated_viewer_json?c=1669501275\u0026lang=us"}



Arrows point to right sternalis muscle.
Case Discussion
The sternalis muscle is an anatomical variant of the anterior chest wall and lay superficially and perpendicular to the pectoralis major muscle. It’s important to recognize this anatomical variant because, in some cases, it may lead to misdiagnosis, like breast carcinoma.