Dysphagia lusoria is due to?

Dysphagia lusoria is a disorder of swallowing caused due to vascular anomalies and includes: A right aoic arch A double aoic arch A vascular constricting ring formed by a PDA or a ligamentum aeriosum and pulmonary aery or aoic arch An abnormal right subclan aery An abnormal innominate aery Diagnosis is made by lipoidal swallow or aeriography. Ref: Bailey and Love 24/e, Page 995