Proceed further mediastinal staging or not

A CT scan without mediastinal lymph nodes > 1.5 cm in size and a negative PET scan obviate the need for further mediastinal staging.

A PET-positive lymph node mandates the need for mediastinoscopy or needle aspiration of the suspicious node.

PET for SPN

一個肺部結節, 作PET檢查若為positive, 則其有90%之準確率為惡性腫瘤
但PET negative並不能完全排除癌症,是因為BAC和carcinoid並不 uptake FDG