RT Book, Section A1 Hay, Jr, William W. A1 Levin, Myron J. A1 Deterding, Robin R. A1 Abzug, Mark J. SR Print(0) ID 1145458205 T1 Pulmonary Sequestration T2 Quick Medical Diagnosis & Treatment Pediatrics YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9781264257614 LK accesspediatrics.mhmedical.com/content.aspx?aid=1145458205 RD 2024/11/11 AB Defined as nonfunctional pulmonary tissue that does not communicate with the tracheobronchial tree and receives its blood supply from one or more anomalous systemic arteriesClassified as either extralobar or intralobarExtralobar sequestrationA mass of pulmonary parenchyma anatomically separate from the normal lung, with a distinct pleural investmentAppears as a solitary thoracic lesion near the diaphragmSize varies from 0.5 cm to 12 cmIntralobar sequestrationAn isolated segment of lung within the normal pleural investment that often receives blood from one or more arteries arising from the aorta or its branchesUsually found within the lower lobes (98%), two-thirds are found on the left side, and it is rarely associated with other congenital anomalies (< 2% vs 50% with extralobar sequestration)Rarely presents in the newborn period (unlike extralobar sequestration)Some researchers have hypothesized that intralobar sequestration is an acquired lesion secondary to chronic infection