PMC3895049_01
Ultrasound from January 2012.
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RJT121F1
The decision was made to obtain an ultrasound (seen in Fig. 1) with close follow-up in the breast surgery clinic. 
Ultrasound from April 2012.
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RJT121F2
Repeat ultrasound (seen in Fig. 2) revealed a stable fluid collection measuring 1.5 x 1.2 x 2.2 cm, once again BIRADS #3 likely benign recommend short-term follow-up with the breast surgeon.
Cross section at low power. Intersecting bundles. Multinucleated giant cell in the bottom right.
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RJT121F3
High power. Bizarre nuclei. High mitotic activity.
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RJT121F4
Immunostain with SMA (smooth muscle actin). Positive cytoplasmic staining indicating smooth muscle origin.
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RJT121F5