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Table 5. Regional Lymph Nodes (pN)a

aReprinted with permission from AJCC: Retinoblastoma. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 562–63.
pNXRegional lymph nodes cannot be assessed.
pN0No regional lymph node involvement.
pN1Regional lymph node involvement (preauricular, cervical).
N2Distant lymph node involvement.