Neuroblastoma is classified into various stages based on the extent of the disease: - Stage 1: Localized tumor with complete gross excision. - Stage 2A: Unilateral tumor with incomplete gross excision. - Stage 2B: Unilateral tumor with or without complete gross excision, with ipsilateral lymph node involvement. - Stage 3: Tumor infiltrating across the midline with or without regional lymph node involvement. - Stage 4: Distant dissemination to lymph nodes, bone, bone marrow, liver, skin, and/or other organs. - Stage 4S: Special category for children under 1 year with localized primary tumor and dissemination limited to skin, liver, and/or bone marrow.
