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Table 2. Definitions of TNM Occult Carcinomaa

Stage TNM Description 
aReprinted with permission from AJCC: Lung. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 253-70.
Occult carcinomaTX, N0, M0TX = Primary tumor cannot be assessed, or tumor proven by the presence of malignant cells in sputum or bronchial washings but not visualized by imaging or bronchoscopy.
N0 = No regional lymph node metastasis.
M0 = No distant metastasis.