[A case of right upper lobe carcinoma with lung torsion changed in position].

A 71-year-old man with a pulmonary carcinoma had torsion of the right upper lobe of the lung. A chest radiogram showed change of the opacified lobe in position. At right thoracotomy, we found that the atelectatic right upper lobe occupied with a giant tumor moved freely in the right thoracic cage due to the defect of parenchymal bridge between the contiguous lobes. Though lung torsion is a rare event, it might be kept in mind as a complication of malignant tumors or life-threatening lung infarctions.