PMC5315254_01
(a) Clinical photograph of a 19-year-old female collegiate rower who presented with a new painful mass (arrow) along the anterolateral chest wall in the region of the seventh through ninth ribs after increasing her training regimen. (b) Close-up photograph of the painful mass (arrow), which was later determined to be a traumatic avulsion of the serratus anterior muscle.
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On physical examination, the patient had a localized firm mass approximately 3 cm in diameter on the lateral curve of the right eighth and ninth ribs (Figure 2).
(a) Axial short tau inversion recovery (STIR) magnetic resonance image (MRI) revealing a large amount of edema with avulsion of the serratus anterior muscle from the right seventh through ninth ribs (arrow). (b) Coronal T2-weighted MRI redemonstrating the large amount of edema and associated serratus anterior rupture from its costal attachments (arrow).
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MRI revealed extensive edema along the right lateral rib wall with partial tearing of the serratus anterior muscle along the seventh through ninth ribs (Figure 3).