international neuroblastoma pathology classification: unfavorable histology group, patient 5 years or older, with any subtype of neuroblastoma (schwannian stroma-poor) and any mitosis-karyorrhexis index
finding of lesion
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