“Myeloid/lymphoid neoplasm with eosinophilia (M/LNs‐Eo) and rearrangement of PDGFRA, PDGFRB or FGFR1, or with PCM1‐JAK2” is recognized as a specific diagnostic category in the 2017 World Health Organization (WHO) classification. The gene discussed is PDGFRA; the disease is lymphoid neoplasm.