[Lipid island (xanthelasma) of the duodenal mucosa--a rarely found diagnosis and differential diagnosis].

A case report ist given on a 54-year-old patient with the so called lipid island (xanthelasma) in the duodenal mucosa. Xanthelasmas are very rarely located in the duodenal mucosa. The diagnosis and differential diagnosis of this entity are reported. The relevance of histochemistry and immunohistochemistry for differentiation of signet ring carcinoma cells in the mucosa is discussed.