대한흉부영상의학회 Korean Society of Thoracic Radiology GuerBet

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대한흉부영상의학회 Weekly Case 검색
대한흉부영상의학회 Weekly Case 검색
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Weekly Chest CasesArchive of Old Cases

Case No : 123 Date 2000-03-04

  • Courtesy of Hak Hee Kim, M.D., Seog Hee Park, M.D. / Kangnam St. Mary's Hospital, Catholic University of Korea
  • Age/Sex 27 / M
  • Chief ComplaintAnterior chest wall discomfort for several weeks
  • Figure 1
  • Figure 2
  • Figure 3

Diagnosis With Brief Discussion

Diagnosis
Sternalis muscle
Radiologic Findings
CT scans show band-like, tubular structure surrounded fat tissue overlying the anterior surface of the pectoralis muscle along medial margin of the muscle.
Brief Review
The sternalis muscle is an uncommon anatomic variant of the chest wall musculature that is of uncertain teleology or function. It runs from the infraclavicular region inferiorly to approximately the caudal aspect of the sternum. Cadaveric studies have shown that the muscle is present in approximately 8% of both males and females and is twice as often unilateral as bilateral. Its longitudinal and parasternal location would make it logical to assume that it represents an aberrant extension of the rectus abdominis muscle; however, it is more superficial than the rectus abdominis and is not contiguous with it.
The recognition of normal variants is important to reduce the number of patients subjected to recall, follow-up examinations, or biopsies.
Occasionally, the muscle is included in medial aspect of the craniocaudal mammogram, and it could produce some diagnostic difficulty. The correct diagnosis is suggested by the location, configuration, and lack of a corresponding abnormality on the lateral views.
References
1. The sternalis muscle: an unusual normal finding seen on mammography. AJR 1996; 166:33-36

2. Barlow RN. The sternalis muscle in American whites Negroes. Anat Rec 1935; 61:413-426
Keywords
Chest wall, Congenital,

No. of Applicants : 26

▶ Correct Answer : 2/26,  7.7%
  • - 源€
  • - Hospital General Universitario de Alicante, Spain Juan Arenas
▶ Semi-Correct Answer : 1/26,  3.8%
  • - Gachon Medical School Gil Medical Center Seo Joon Beom
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