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肺癌的肿瘤分期及CT影像学表现 南方医科大学第一临床医学院 T1 T1: A tumor less than or equal to 3 cm in greatest dimension, surrounded by lung or visceral pleura, without bronchoscopic evidence of invasion more proximal than the lobar bronchus (i.e., not in the main bronchus). T1 T1 Example 2: This is an example of a T1 lesion in the left lung (the nodular density in the right lung anteriorly [blue arrow] is the inferior margin of the right clavicular head). The tumor measures 1.8 cm in size and is completely surrounded by lung. A thin linear density radiates to the pleural surface from the lesion- this is referred to as a pleural tag which is felt to represent tumor-induced thickening of the interlobular septa. There is a focal triangular-shaped pleural-based density identified at the insertion of the pleural tag (black arrow). This finding is felt to be secondary to the desmoplastic reaction incited by the tumor. There is retraction of the visceral pleura towards the lesion, and a small quantity of fluid collects within the space formed between the visceral and parietal pleura producing the finding identified on computed tomography. The finding does not indicate visceral pleural invasion. T2 T2: A tumor with any of the following features: i) Larger than 3 cm in largest dimension ii) Associated with atelectasis or post-obstructive pneumonitis that extends to the hilar region, but does not involve the entire lung iii) Invades the visceral pleura T2 i) Larger than 3 cm in largest dimension This large squamous cell carcinoma measures 5.4 cm in transverse dimension. Linear densities radiate to the pleural surface from the lesion. There is a focal pleural-based density identified laterally (blue arrow), but the underlying subpleural fat is not disrupted. This finding is likely due to the desmoplastic reaction incited by the tumor. As previously discussed, retraction of the visceral pleura towards the lesion permits the development of a potential space between the visceral and parieta
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