Diabetes mellitus type I, coeliac disease and Imerslund-Graesbeck-syndrome: simply an unusual combination of rare diseases?

We describe the clinical course of a girl with onset of type I diabetes mel litus at the age of 3 years. At the age of 10, coeliac disease and shortly thereafter a vitamin B-12 deficiency anemia (Imerslund-Graesbeck-syndrome) was diagnosed. Her younger sister also suffered from Imerslund-Graesbeck-sy ndrome when she was 11 year old. This unusual, so far not described associa tion of rare diseases suggests a common autoimmune etiology.