Diagnosis requires a<unk> iopsy, so that the exact type of tissue can<unk> e determined<unk> y examination under a microscope.<unk>  is generally considered a sub-type of diffuse large<unk> -cell lymphoma, although it is also closely related to nodular sclerosing Hodgkin lymphoma (NSHL). Tumors that are even more closely related to NSHL than typical for<unk>  are called gray zone lymphoma.
Primary mediastinal B-cell lymphoma
Thymic carcinoma
Thymoma with immunodeficiency
Tuberculous lymphadenitis
Nodal marginal zone B cell lymphoma
Primary effusion lymphoma
Gray zone lymphoma
Thymoma-associated multiorgan autoimmunity