| Summary points: | A 57-year-old who completed a course of radiation for breast carcinoma 9 months earlier presents with a spontaneous, painful, and discoloured swelling of the left breast that was initially diagnosed as cellulitis but did not respond to antibiotics treatment. This case report describes the review of the radiotherapy plans, histological findings, response to various treatments, and outcome, and includes a series of images. The authors also provide a review of the literature on this complication of radiation therapy. |