How is primary tumor size estimated on imaging studies for lung cancer staging?

Updated: Jan 28, 2019
  • Author: Omar Lababede, MD; Chief Editor: Eugene C Lin, MD  more...
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The maximal dimension of the lesion on multiplanar reconstructed CT scans (in lung window settings) is generally used. [18] In tumors with surrounding hemorrhage or changes of postobstructive pneumonitis and/or atelectasis, estimating the size of the primary neoplastic lesion by CT scanning can be challenging (especially on noncontrast CT). In some of these cases, PET scanning and MRI can delineated the tumor from the surrounding changes.

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