Table 1.

Four major stages in “the international neuroblastoma risk group staging system”.

Stage	Description
L1	Localized tumour without any detectable image-defined risk factors
L2	Localized tumour with one or more image defined risk factors
M	Metastatic disease
MS	Metastatic disease with metastases confined to skin, liver, and/or bone marrow (confined to children ≤ 18 month)