Editing Pediatrics: Renal and Adrenal Oncology (section)

=== Staging ===
{| class="wikitable"
|'''Stage'''
|'''Description'''
|-
|'''1'''
|
* Localized tumor
* Complete gross excision
* Ipsilateral lymph nodes involvement negative under microscopic examination
|-
|'''2A'''
|
* Localized tumor
* '''Incomplete gross resection'''
* Ipsilateral lymph nodes involvement negative under microscopic examination
|-
|'''2B'''
|
* Localized tumor
* Complete or incomplete gross resection
* '''Ipsilateral lymph nodes involvement positive under microscopic examination'''
* Enlarged contralateral lymph nodes but with negative involvement under microscopic examination
|-
|'''3'''
|
* '''Localized unilateral tumor with contralateral lymph nodes involvement positive under microscopic examination'''

<center>'''or'''</center>

* '''<span style="color:#ff0000">Unresectable unilateral tumor</span> infiltrating across the midline''' with positive or negative regional lymph node involvement

<center>'''or'''</center>

* Unresectable midline tumor with bilateral infiltration or lymph node involvement
|-
|'''4'''
|
* '''<span style="color:#ff0000">Metastasis of the tumor to distant lymph nodes'''
* '''<span style="color:#ff0000">Metastasis of the tumor to liver, skin, organs (except as defined by Stage 4S)'''
|-
|'''4S'''
|
* '''Limited to infants <1 year of age'''
* '''Localized primary tumor (as defined for stage 1, 2A, or 2B)'''
* '''Metastasis of the tumor limited to skin, liver and/or bone marrow'''
* '''Bone marrow involvement in stage 4S should be minimal''' (<10% of total nucleated cells identified as malignant on bone marrow biopsy)
|}