Gastrointestinal bleeding due to suspected anisakiasis: challenging differential diagnosis for a rare disease.

As compared with Eastern countries, the incidence of gastrointestinal diseases caused by the ingestion of nematode eggs is very low in Europe, in spite of the fact that the consumption of raw fish has increased in these countries as well in recent years. The authors present here, a rare case of gastrointestinal bleeding due to Anisakis simplex. This is a very uncommon clinical presentation which rise several problems in diagnosis and management.