Incidence of mediastinal node involvement in clinical T1 XXXX .

@entity1 @entity957 @entity189 @entity153 @entity3 @entity420
The incidence of mediastinal node involvement of T1 non-small-cell @entity153 was determined in 262 @entity1 for the period June 1981 to January 1986. All @entity1 underwent mediastinoscopy as part of their evaluation. Thirty-five @entity1 (13%) had clinical primary T1 lesions. There were 17 @entity420 , 10 @entity957 , 6 large-cell @entity189 and 2 @entity189 . Five @entity1 had node involvement at mediastinoscopy: two had large-cell @entity189 and one was a @entity957 . Thoracotomy in the remaining 30 @entity1 revealed 2 with pleural @entity3 , 1 with @entity420 with @entity3 to the subaortic nodal area (not assessed by cervical mediastinoscopy). The other @entity1 underwent resection, for a resectability rate of 90%. Therefore the overall incidence of mediastinal node involvement in this series was 17% (6 of 35) and was found to be highest among @entity1 with large-cell @entity189 (2 of 6), followed by @entity420 (3 of 19) and @entity957 (1 of 10). The larger number of large-cell @entity189 in this series probably accounts for the higher incidence of N2 disease found compared with that of previous studies in the literature. Accordingly, preoperative mediastinal staging is recommended for all T1 large-cell @entity189 and @entity420 and for suspicious lesions of undetermined histology.
