The features of the Chilaiditi Syndrome are described, together with the historial background, and a brief review of the literature on the condition is given. The prevalence in our geriatric population was found to be 1% and the 13 cases seen over 22 months are reported briefly. The prevalence increases with age and may be related to the consumption of drugs by the elderly; although in the majority it is asymptomatic, it may, particularly when associated with gastrointestinal symptoms, lead to unnecessary laparotomy. In the geriatric patient, interposition of the bowel should be considered in the differential diagnosis of air under the right hemidiaphragm.