Original: Thomas Hodgkin published the first description of lymphoma in 1832, specifically of the form named after him, Hodgkin's lymphoma. Since then, many other forms of lymphoma have been described, grouped under several proposed classifications.
Simplified: There are many types of lymphoma, including Hodgkin's lymphoma, the primary central nervous system lymphoma, the B-cell lymphoma, and the hepatosplenic lymphoma.