Sternalis Muscle- Rare Presentation in Routine Surgical Practice
Theebanraja Ramalingam, Maya Mazuwin Yahya, Siti Rahmah Bt Hashim Isa Merican, Wan Zainira Wan Zain, Zaidi Zakaria
Asian Journal of Case Reports in Surgery · pp. 388–392 · Published 29 Dec 2020
Abstract
During routine mastectomy dissection of an anterior chest wall mass, a unilateral appearance of the right sternalis muscle (SM) was observed. It originated from the sternal part of the right sternocleidomastoid muscle (SCM). The right SM muscle fibres travelled down inferior laterally and inserted on the ipsilateral 5th–7th ribs and the aponeurosis of the external oblique muscle. The innervation to the muscle could be traced to the 4th, 5th, and 6th anterior intercostal nerves. Awareness of the location of the sternalis will help medical doctors avoid misdiagnosis during mammography or misjudgement during breast surgery. Because of its superior attachment to the SCM, clinicians need to be aware of such an anomaly.
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