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Retinoblastoma Treatment (PDQ®)

  • Updated: 12/06/2013

Table 3. Metastasis (M)a

M0No metastasis.
M1Systemic metastasis.
M1aSingle lesion to sites other than CNS.
M1bMultiple lesions to sites other than CNS.
M1cPrechiasmatic CNS lesion(s).
M1dPostchiasmatic CNS lesion(s).
M1eLeptomeningeal and/or CSF involvement.

CNS = central nervous system; CSF = cerebrospinal fluid.
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.