Perianastomotic ulcerations represent a late and frequently unrecognized complicationof perinatal surgery. We retrospectively reviewed 8 cases which presented iron deficiency anaemia related to occult gastrointestinal bleeding. The diagnosis was difficult and required many investigations, but it was finally obtained through endoscopic procedures. The pathogenesis of this disorder is unclear and its natural history is characterized by high frequency relapse. The treatment is empiric, based on pharmacological therapy(antibiotics, proton pump inhibitors) and on reintervention in case of severe and intractable symptomatic disease.