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Retinoblastoma Treatment (PDQ®)

  • Updated: 08/25/2014

Table 4. Primary Tumor (pT)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.
pTxPrimary tumor cannot be assessed.
pT0No evidence of primary tumor.
pT1Tumor confined to eye with no optic nerve or choroidal invasion.
pT2Tumor with minimal optic nerve and/or choroidal invasion.
pT2aTumor superficially invades optic nerve head but does not extend past lamina cribrosa or tumor exhibits focal choroidal invasion.
pT2bTumor superficially invades optic nerve head but does not extend past lamina cribrosa and exhibits focal choroidal invasion.
pT3Tumor with significant optic nerve and/or choroidal invasion.
pT3aTumor invades optic nerve past lamina cribrosa but not to surgical resection line or tumor exhibits massive choroidal invasion.
pT3bTumor invades optic nerve past lamina cribrosa but not to surgical resection line and exhibits massive choroidal invasion.
pT4Tumor invades optic nerve to resection line or exhibits extra-ocular extension elsewhere.
pT4aTumor invades optic nerve to resection line but no extra-ocular extension identified.
pT4bTumor invades optic nerve to resection line and extra-ocular extension identified.