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Table 2 Descriptions of INRG tumor stages [6]

From: Assessment of the validity of image-defined risk factors (IDRFs) in abdominal neuroblastoma

Tumor stageDescription
L1Localized tumor not involving vital structures, as defined by the list of IDRFs, and confined to one body compartment
L2Local-regional tumor with presence of one or more IDRFs
MDistant metastatic disease (except stage MS tumor)
MSMetastatic disease in children younger than 18 months, with metastases confined to skin, liver, and/or bone marrow