Acute Leukemia of Ambiguous Lineage

**Semantic type:** Neoplastic Process

**Definition:** An acute leukemia in which the blasts lack sufficient evidence to classify as myeloid or lymphoid or they have morphologic and/or immunophenotypic characteristics of both myeloid and lymphoid cells. (WHO, 2001)

**Synonyms:** - ALAL - Acute Leukemia of Ambiguous Lineage (ALAL) - Acute Leukemia of Indeterminate Lineage - Acute Leukemia of Indeterminate Lineage - Acute Leukemia, ambiguous lineage (mixed or biphenotypic)