Bilateral sternalis muscle at mammography

Case contributed by Mark Holland
Diagnosis almost certain


Third round breast screen

Patient Data

Age: 55 years
Gender: Female

Triangular opacities seen medially in both breasts represent the sternalis muscle. Only seen on the CC and Cleavage views


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.

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