One case of Pulmonary sequestration was diagnosed at the Pediatric Department of An Binh Hospital, HCM city. Pulmonary sequestration is a term applied to a congenital broncho-pulmonary foregut malformation that does not communicate with the tracheo-bronchial tree and receives its blood supply from an anomalous systemic artery rather than the pulmonary circulation. Clinical findings are poor and Imaging studies are necessary for confirming the diagnosis.