Sternalis muscle

Case contributed by Andressa Wiltgen
Diagnosis certain


Incidental finding.

Patient Data

Age: 60 years
Gender: Female

Sternalis muscle (red arrow) - thin vertical muscle band in the anterior chest wall, superficially to the right major pectoralis muscle.

Annotated image

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.

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