Ilio-psoas abscess in Crohn's disease.

We encountered 12 patients with psoas abscess in a two-year period. Of these, four were due to Crohn's disease making this the most important single cause of such abscesses in our series. Psoas abscess may be the presenting complaint in Crohn's disease and it should be considered as a possible cause of any psoas abscess from which enteric organisms are cultured.