leukocyte disorder leukostasis https://www.malacards.org/card/leukostasis MedDRA:10024404 DOID:12986 MONDO:0006831 MESH:D018921 EFO:1001016 UMLS:C0282548 leukostasis (morphologic abnormality) GARD:0024481 MEDGEN:84394 A disorder involving the aberrant infiltration and aggregation of leukocytes into the vasculature of the body. Leukostasis is typically detected in the brain and lungs of persons with leukemia. It requires substantial ablative modalities to both reduce the number of cells present and to ensure dispersion of the aggregates.