Sternalis muscle

Case contributed by Dr Kostas Boutsiadis


Routine screening mammography.

Patient Data

Age: 50
Gender: Female

CC view

Mass-like, asymmetric opacity at the medial posterior edge of the breast on the left CC projection. 

Case Discussion

The sternalis muscle is a normal anatomic variant of the chest wall. Mostly it appears on medial posterior edge of the breast on CC views, but may also be detected on MLO projections. Can be unilateral in 70%. Has varying shapes, contours and sizes and may mimic a mass lesion on mammogram. Knowledge of anatomy and mammographic appearance is important for avoiding confusion with a malignant lesion.

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Case information

rID: 28281
Case created: 18th Mar 2014
Last edited: 10th Dec 2015
System: Breast
Inclusion in quiz mode: Included

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