Dictionary of Cancer Terms
View in Spanish: Crisis blástica
Blast crisis (blast KRY-sis)
A phase of chronic myelogenous leukemia in which tiredness, fever, and an enlarged spleen occur during the blastic phase, when more than 30% of the cells in the blood or bone marrow are blast cells (immature blood cells).
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.