[Extraintestinal complications of Crohn disease, demonstrated in a patient]

A patient with different extraintestinal complications of Crohn's disease is demonstrated. The case allows a discussion of frequency and importance of such complications in Crohn's disease. Vitamin-und trace element deficiency, protein loss and renal complications are the main complications. Determination of vitamin and trace elements may early detect beginning extraintestinal complications and may induce a corresponding therapy.