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

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 (finding)