Abstract
An abnormal shadow was detected on the annual check up X-ray film of a 63-yearold male with cough. Malignant cells were obtained by TBAC from the No.11 lymph node, and cytological diagnosis suggested poorly differentiated adenocarcinoma or large cell carcinoma. At surgery the enlarged No.11 lymph node was found between the right upper lobe bronchus and the truncus intermedius. There was no adhesion or invasion to the bronchus. We added hilar and mediastinum lymph node dissection but the result was negative apart from the No.11 lymph node.
After operation, we have been following up this case for about 26 months, but we have not been able to detect any primary lesion yet. We think this case was a very rare case of primary-unknown T0N1M0 lung cancer, or primary carcinoma originated from the ectopic epithelial cells in the lymphnode.
