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case_images: Illustrated diagram of mass location. Original illustration by YaQun Zhou (2020).
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case_images: A 68-year-old Caucasian male presented for surgical evaluation with a right mid-infraclavicular chest mass from referral of his primary care physician (Fig. 1).
case_images: Hematoxylin and eosin stain of patient sample showing characteristic storiform array with mitotic figures.
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case_images: Microscopic examination with hemolysin and eosin staining showed whorled myoid with spindled nuclei in storiform array throughout the dermis and extending into the subcutaneous fat with widening fibrous septa (Fig. 2, Fig. 3).
case_images: Immunohistochemistry stain of patient sample showing positive reaction for CD34 markers.
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case_images: The sample stained positively for CD34 and ultimately diagnosed as DFSP (Fig. 4).