1. Two cases in one family of Kartagener's syndrome are described, and the radiological findings are illustrated.2. One case presented with an anomalous left subclavian artery passing behind the œsophagus. This diagnosis is based on radiographic and fluoroscopic findings.3. As far as can be ascertained an anomalous left subclavian artery in a case of dextrocardia has not been recorded previously.4. No symptoms accompanied this anomalous great vessel development.5. The two cases described appear to support the theory that the syndrome described by Kartagener is a triad of congenital origin.