[Delusion of parasitosis: report of twelve cases].

In this paper, the history of the chronic delusional syndrome known as delusional parasitosis or Ekbom syndrome is reviewed as well as its main clinical characteristics, evolution, nosographic position and therapeutic approaches. The findings in the published literature are compared with the clinical experience of the authors who have studied twelve cases. The possible connection with other mental diseases, specifically Obsessive Compulsive Spectrum, is evaluated.