Medical Lymphoma vs Leukemia: Origin & Differences

[Tyto alba]

Lymphoma is a cancer due to malignancy of lymphocytes.
Leukemia is a cancer due to malignancy of leukocytes usually beginning in the bone marrow ( that includes lymphocytes too).
The thing I don't understand is what is the starting point of these two types of cancer (difference in their origin).

Thank you.

 

[Andy Resnick]

Lymphoma is a cancer due to malignancy of lymphocytes.
Leukemia is a cancer due to malignancy of leukocytes usually beginning in the bone marrow ( that includes lymphocytes too).
The thing I don't understand is what is the starting point of these two types of cancer (difference in their origin).

Thank you.

The family of leukemias originate in bone marrow, lymphomas originate in the lymphatic system.

http://sylvester.org/cancer/leukemia-lymphoma-and-myeloma/education/definition

Not sure about myelomas.