Pulmonary sequestration is a congenital malformation consisting of non-functioning and usually cysticbronchopulmonary separation from normal pulmonary tissue. We have analysed five cases of pulmonary sequestrationfor recent two years. The resutls were as follows: 1. Four cases were intralobar type, one case was extralobartype. 2. Among the four cases of intralobar type, three cases were located at posterior basal segment of the leftlower lobe and one case was located at posterior vasal segment of the right lower lobe. One case of extralobartype was located between posterior basal segment of the left lower lobe and the left hemidiaphragm. 3. Four casesof the sequestered pulmonary tissue revealed cystic or multiloculated cystic appearance with or without air-fluidlevel. One case appeared as a round homogeneous soft tissue mass.