Acute Leukemia of Ambiguous Lineage, Not Otherwise Specified

**Semantic type:** Neoplastic Process

**Definition:** Acute leukemia of ambiguous lineage, expressing combinations of markers that do not allow for its classification as either acute undifferentiated leukemia or mixed phenotype acute leukemia, and definitive classification along a single lineage is difficult. (WHO 2017)

**Synonyms:** - Acute Leukemia of Ambiguous Lineage, NOS