Dermatofibrosarcoma protuberans (DFSP) is a rare superficial soft tissue malignancy. We report a 45-year-old woman diagnosed with DFSP involving the breast. Ultrasound of DFSP revealed a heteroechogenetic breast mass, which showed normal adjacent dermis. Mammography disclosed a high-density mass without microcalcification. MRI showed an enhancing lobulated lesion with small area of cystic change and hemorrhage. The patient underwent excision biopsy and pathology revealed DFSP of the breast. DFSP involving the breast is rare and preoperative diagnosis by imaging could be a challenge for clinicians. A solitary mixed echogenicity and ill-defined soft tissue with no microcalcification located in the subdermal region could indicate the presence of DFSP.
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