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
international neuroblastoma pathology classification: unfavorable histology group, patient of any age, with ganglioneuroblastoma, nodular (composite schwannian stroma-rich/stroma-dominant and stroma-poor)