Clinical characteristics of MH at diagnosis. (A) Proportion of MH classified into primary or secondary MH. (B) Frequency of hematologic malignancies in secondary MH. (C) Organs affected by MH are listed in order of frequency. CLL, chronic lymphocytic leukemia; CMML, chronic myelomonocytic leukemia; CNS, central nervous system; DLBCL, diffuse large B-cell lymphoma; MDS, myelodysplastic syndrome; MM, multiple myeloma; MZL, marginal zone lymphoma.