[Pernicious anemia: a teenager with an unusual cause of iron-deficiency anemia]. / La maladie de Biermer: une cause possible d'anémie microcytaire chez l'adolescent.

A teenager was admitted with an iron-deficiency anemia. The gastroscopy found an atrophic body gastritis, which revealed a pernicious anemia. This diagnosis is rare in paediatric patients, the frequency of pernicious anemia increasing with age. Iron-deficiency anemia is mainly described in young people.