History: This is a skin biopsy from the breast of a 70 year old woman. What is your interpretation?
Diagnosis: This angiosarcoma arose in the skin overlying the breast in a patient who was status post therapeutic radiation for mammary carcinoma. The immunohistochemical stain is a CD31.
Comment: This lesion arose just 3 years after radiation, which is early but not unprecedented.
PMID: 30251277
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