international neuroblastoma pathology classification: favorable histology group, patient less than 1.5 years of age, with poorly differentiated neuroblastoma (schwannian stroma-poor), and low or intermediate mitosis-karyorrhexis index
clinical finding
international neuroblastoma pathology classification: unfavorable histology group, patient less than 1.5 years old, with poorly differentiated or differentiating neuroblastoma (schwannian stroma-poor) and high mitosis-karyorrhexis index