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Cadaveric studies have shown that the muscle is present in ~5% (range 1-8%) of both males and females and is twice as often unilateral as bilateral. The sternalis muscle runs from the jugular notch of the manubrium superiorly, to approximately the caudal (inferior) aspect of the sternum.
4 maj 2012 · Familiarity with its mammographic appearance and ultrasonographic correlation is essential to avoid confusion with a malignant lesion. In this case report, we describe mammographic and ultrasonographic imaging findings of the sternalis muscle and review the literature.
22 cze 2023 · The mammographic appearance of the sternalis muscle is variable. Typically it is visible in the medial aspect of the breast on the craniocaudal mammogram and appears as a small soft tissue density/mass abutting the chest wall.
The sternalis muscle is a normal anatomic variant, present in 6 - 8% of people. It can be misinterpreted as a potentially worrisome mass on a screening mammogram, leading to unnecessary extra views, diagnostic workups and even biopsies.
Ultrasound imaging of the sternalis muscle reveals a well-defined, hypoechoic structure with internal striations, consistent with the appearance of skeletal muscle. Ideally, its continuity with chest wall muscles can be traced to prove muscular origin.
Extra examinations were reviewed, including ultrasound (US), computed tomography (CT) and magnetic resonance imaging (MRI). Results: The prevalence of the sternalis muscle was 0.018%. Its contours were well-defined, irregular or spiculated, and the diameter ranged from 3-4 mm to 15 mm.
1 gru 2022 · The muscle can cause “sternalis syndrome” and chest wall asymmetry. • Sternalis may affect the interpretation of mammograms and electrocardiograms. • Sternalis may provide medial muscle coverage of a breast tissue expander.
