What are malignant hemopathies and Lymphomas?

Non Hodgkins (B or T, high (large lymphocytes) or low grade) may be diffuse or nodular (follicular organization) Hodgkins (monstrous tumor cells seen by Reed-Sternberg cells B lymphoid cell derived from germinal center. Lymphomas (variable aggressiveness, needs histo for dx, immuno + biomol + cytogenetics, most frequent in nodes, but can be extra-ganglionic sites, complex classification,