Figure 5. Breast cancer cutaneous metastasis presenting as targetoid and annular erythema in the radiation therapy port on the left chest and annular erythema on the right breast.

A frontal view of erythematous macular cutaneous breast cancer metastases, not only within the radiotherapy port (black rectangle) on the left chest, but also on the right breast of a 54-year-old Caucasian woman who had been diagnosed with invasive ductal left breast cancer two-and-a-half years ago and had been treated with preoperative and postoperative chemotherapy, left breast mastectomy, and radiation therapy to the left chest wall during the subsequent year; she currently had been receiving daily hormonal therapy for 15 months. The patient had experienced contact of her right breast and left chest with an airbag during an automobile accident four months earlier; the skin metastases appeared one month ago. Before establishing the diagnosis of breast cancer cutaneous metastases, the patient considered the pruritic erythematous annular (black ovals) and targetoid (black arrow) lesions to be dermatitis from contact with the airbag.