International neuroblastoma pathology classification: Favorable histology group, patient age 1.5 years up to but less than 5 years, with differentiating neuroblastoma (Schwannian stroma-poor), and low mitosis-karyorrhexis index

International neuroblastoma pathology classification: Favorable histology group, patient age 1.5 years up to but less than 5 years, with differentiating neuroblastoma (Schwannian stroma-poor), and low mitosis-karyorrhexis index (finding)