Myelomatosis, also known as multiple myeloma, is a type of cancer that affects the bone marrow. There are several synonyms for myelomatosis that are commonly used, including plasma cell myeloma, Kahler's disease, and myeloma. Plasma cell myeloma refers to the abnormal growth of plasma cells in the bone marrow, while Kahler's disease is a specific subtype of multiple myeloma that affects the bone marrow and other organs. Myeloma is a more general term for the condition, which can affect different parts of the body, including the bone marrow, bones, and kidneys. Regardless of the term used, myelomatosis is a serious and potentially life-threatening condition that requires prompt medical attention and treatment.