Intrapulmonary lobar sequestration 2011-12-31T07:43:28Z Intralobar sequestration (ILS) may be diagnosed on antenatal ultrasound screening. ILS can be asymptomatic in later life or can lead to signs and symptoms related to inadequate tracheobronchial drainage caused by the lesion of adjacent atelectatic lung. HP:0010961 HP:0011278 Intrapulmonary sequestration A type of pulmonary sequestration that occurs within the visceral pleura of normal lung tissue, usually without communication with the tracheobronchial tree. UMLS:C4023436 Intralobar sequestration Pulmonary sequestration