[Radio-induced breast morphoea: an unrecognized complication].

Morphoea is a localized scleroderma. Since the 1990s, it is described as a complication after irradiation for breast cancer. This complication is unrecognized and underdiagnosed. Irradiation seems to be a factor inducing an autoimmune process. Clinicians should be aware in case of an erythema in a treated area, appearing on average one year after the end of the irradiation. Histology alone can prove the diagnosis and rule out differential diagnoses: principally mastitis (carcinomatous, infectious), chronic radiodermatitis or radiation recall. Treatment of this rare complication is not consensual; it is most often topical steroids. The evolution is marked by a gradual decrease from the initial inflammation. Sclerosis persists, more or less substantially.