Blood disorders, both benign and malignant, are the territory of the hematologist. Dr. Steven Rosen details a number of different cancers that are blood disorders.
Acute leukemia develops very quickly. Chronic leukemia develops slowly over a period of years.
Non-Hodgkin's lymphoma, and Hodgkin's disease which is less common but is still a lymphoma, are cancers that are blood disorders. Multiple myeloma is an incurable blood cancer.
"Steven Rosen, M.D., F.A.C.P., is Genevieve Teuton Professor of Medicine, at the Feinberg School of Medicine, Northwestern University and Director of the Robert H. Lurie Comprehensive Cancer Center of Northwestern University and Director of Cancer Programs at Northwestern Memorial Hospital. Following his graduation with distinction from Northwestern University Medical School's Six-Year Honors Program in 1976, Dr. Rosen completed his residency in Internal Medicine at Northwestern and a fellowship in Medical Oncology at the National Cancer Institute. Dr. Rosen's laboratory research focuses on experimental therapeutics and hematologic malignancies."
Video
https://www.empowher.com/leukemias/content/what-role-hematologist-dr-rosen-video