Pulmonary ligament consists of 2 serosal layer of pleura that connect the lower lobe to the mediastinum. Author analyse and present CT appearance of pulmonary ligament of the 40 normal and abnormal patients on the basis of anatomic knowledge from the cross section of cadaver. Left pulmonary ligament is more frequency visualized than the right. The most important CT landmark in localizing pulmonary ligament is the esophagus where ligament attaches on its lateral wall. Pitfalls in CT identification of pulmonary ligament are right phrenic nerve and right pericardiaco-phrenic vessels which emerge from the lateral wall of the IVC and wall of the emphysematous bulla in the region of the pulmonary ligament.