Compression syndrome of the celiac trunk or Dunbar's syndrome is usually caused by an overly large medial arcuate ligament of the diaphragm. Symptoms are postprandial periumbilical pain, the pathogenesis of which, in spite of abundant collateralization of the celiac trunk, has not yet been clarified. The diagnosis should be established by elimination via lateral aortography. Therapy consists of incision of the ligament, creation of a aorto-celiac bypass, or reinsertion of the celiac trunk. Treatment, however, is successful in only 41% of the operated patients.