11. Lymphoreticular system

11. Lymphoreticular system: 

Lymphomas are lymphoid neoplasms that result from proliferation of lymphoid cells that form discrete tissue masses and present as enlarged non tender lymph nodes. In lymphoid neoplasms the antigen gene rearrangement precedes transformation; hence, all the daughter cells derived from the malignant progenitor share the same antigen receptor gene configuration and sequences, and synthesize identical antigen receptor proteins and are thus monoclonal.