Abstract: Ultrasonographic evaluation of cancerous invasion into the pleura and chest wall was done in 53 patients with lung cancer.The author also ultrasonographically classified these changes into four grades,and equated these to the respective grades according to surgical findings.The agreement between ultrasonographic and operative findings was satisfactory,the total accuracy rate of dignosis being 77%(41/53).This method played a very important role in deciding whether or not surgery should be carried out and in judging the prognosis of the pationt.