Childhood Acute Lymphoblastic Leukemia CNS 2 Toronto Guidelines v2

**Semantic type:** Neoplastic Process

**Definition:** No clinical signs of CNS involvement and blasts in CSF and either: WBC < 5/μL CSF or WBC > or = 5/uL CSF and RBC > or = 10/uL CSF and WBC/RBC in CSF < or = 2x WBC/RBC in blood. (Childhood cancer staging for population registries according to the Toronto Childhood Cancer Stage Guidelines - Version 2. Cancer Council Queensland and Cancer Australia: Brisbane, Australia; 2021.)

**Synonyms:** - Acute lymphoblastic leukemia CNS2 - Childhood Acute Lymphoblastic Leukemia Central Nervous System 2 Toronto Guidelines v2 - Pediatric Acute Lymphoblastic Leukemia CNS 2 Toronto Guidelines v2 - Pediatric Acute Lymphoblastic Leukemia Central Nervous System 2 Toronto Guidelines v2