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Table 6. Primary Tumor (T) for Eyelid Carcinomaa

aReprinted with permission from AJCC: Carcinoma of the Eyelid. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 523-6.
TXPrimary tumor cannot be assessed.
T0No evidence of primary tumor.
TisCarcinoma in situ.
T1Tumor ≤5 mm in greatest dimension.
Not invading the tarsal plate or eyelid margin.
T2aTumor >5 mm but not >10 mm in greatest dimension.
Or, any tumor that invades the tarsal plate or eyelid margin.
T2bTumor >10 mm but not >20 mm in greatest dimension.
Or, involves full thickness eyelid.
T3aTumor >20 mm in greatest dimension.
Or, any tumor that invades adjacent ocular or orbital structures.
Any T with perineural tumor invasion.
T3bComplete tumor resection requires enucleation, exenteration, or bone resection.
T4Tumor is not resectable because of extensive invasion of ocular, orbital, craniofacial structures, or brain.