Screening mammography requires high-quality images and experienced radiologists. An improved technique with a systematic approach to patient positioning enables visualization of the deep parts of the breast. The sternalis muscle is occasionally observed in mammograms as a variant of the deep normal structures and may mimic a mass. The sternalis muscle is an uncommon anatomic variant of the chest wall musculature. It is located subcutaneously over the pectoralis muscle and has a parallel course to the sternum. It runs from the infraclavicular area to the caudal aspect of the breast. This inconsistent muscle has varying shapes, contours and sizes and may mimic a mass lesion on the craniocaudal (CC) mammogram. 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. The sternalis muscle is a supernumerary muscle located in the anterior thoracic region, running parallel to the sternum. Different anatomical studies have reported the prevalence of the sternalis muscle to be 1.923.5% (4). It was first shown on mammography by Bradley et al. (5), who described it in six women. Case ReportA forty-eight year old patient was interpreted in our centre for screening mammography. Standard CC and MLO views were obtained and interpreted with previous mammograms. CC mammogram demonstrated a developing density in the medial posterior part of the breast. The density was round in shape and the edges were well defined ( Figure 1). As we interpreted that lesion as a developing density, ultrasound examination was performed. Ultrasonographic views showed approximately 5x35x70 mm muscle tissue over the right pectoralis muscle. The muscle tissue was well
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