Related Experiment Video
Updated: May 6, 2026
13:35
Endoscopic Bilateral Nipple-sparing Mastectomy via a Single Axillary Incision with Immediate Pre-pectoral Implant-based Breast Reconstruction
Published on: May 17, 2024
5.8K
A Rare Normal Variant with an Unusual Presentation on a Male Mammogram: A Case Report
Victoria Kai Lin Tay1, Si Ying Tan2,3,4, Chow Yin Wong2,4
1Department of Diagnostic Radiology, Singapore General Hospital, Singapore.
Journal of the Korean Society of Radiology
|February 17, 2025
Summary
The sternalis muscle, an anatomical variant, can mimic breast masses on mammography. Recognizing its varied appearance, especially when hypertrophic, prevents misdiagnosis and unnecessary procedures.
Area of Science:
- Anatomical Variants
- Radiology
- Medical Imaging
Background:
- The sternalis muscle is a rare supernumerary muscle in the anterior thoracic region.
- Its variable morphology can lead to misinterpretation in mammography.
- This can result in the misdiagnosis of breast masses.
Observation:
- A 23-year-old male presented with painless bilateral breast enlargement.
- Mammography revealed symmetrical, well-defined soft tissue masses.
- These masses were consistent with bilateral sternalis muscles, noted to be hypertrophic.
Findings:
- The hypertrophic sternalis muscles were attributed to intense upper body weight training.
- This case demonstrates an unusual presentation of a common anatomical variant.
- Imaging findings mimicked bilateral breast masses.
Implications:
- Highlights the importance of recognizing sternalis muscle presentations on mammography.
- Aids radiologists in avoiding misdiagnosis of breast masses.
- Prevents unnecessary patient work-up and anxiety associated with potential breast cancer.
