pulmonary sequestration is a congenital malformation consisting of non-functioning and usually cystic bronchopulmonary separation from normal pulmonary tissue. We have analysed five cases of pulmonary sequestration for recent two years. RESULTS : 1. Four cases were intralobar type, one case was extralobar type. 2. Among the four cases of intralobar type, three cases were located at posterior basal segment of the left lower lobe and one case was located at posterior basal segment of the right lower lobe. 3. Four cases of the sequestered pulmonary tissue revealed cystic or multiloculated cystic appearance with or without air-fluid level. One case appeared as a round homogeneous soft tissue mass.