Myeloid neoplasm associated with PDGFRB rearrangement

**Definition:** A distinct type of myeloid neoplasm that occurs in association with rearrangement of PDGFRB gene at 5q32. Patients usually present with a picture resembling chronic myelomonocytic leukaemia and, less often, atypical chronic myeloid leukaemia or chronic eosinophilic leukaemia.