[A Case of Radiation Recall Dermatitis That Was Difficult to Distinguish from Inflammatory Breast Recurrence].

The case involved a 51-year-old woman who was diagnosed with Stage Ⅰ right breast cancer(cT1, N0, M0). Partial resection of the right breast and sentinel lymph node biopsy were performed. The histological type was found to be Stage Ⅰ triple-negative medullary carcinoma with pT1c, pN0(sn), and M0. A pituitary tumor was diagnosed after discharge. After removal of the pituitary tumor, whole-breast irradiation was performed. Subsequently, chemotherapy was started. Approximately 5 months after surgery, redness and swelling of the right breast were observed. Inflammatory breast cancer recurrence could not be ruled out by imaging, and skin biopsy was performed. No malignant findings were observed, and the symptoms were considered to indicate radiation recall dermatitis caused by chemotherapy. When chemotherapy was discontinued, the redness of the right breast improved.