immunoblastic lymphoma

immunoblastic lymphoma

[-blas′tik]

a proliferation of immunoblasts involving the lymph nodes.

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lymphoma

any neoplastic disorder of lymphoid tissue. Often used to denote malignant lymphoma, classifications of which are based on predominant cell type and degree of differentiation; various categories may be subdivided into nodular and diffuse types, depending on the predominant pattern of cell arrangement. There is also a great deal of difference in the types of disease in the different animal species. There is a system of classification based on the histological characteristics of the lymphocytes.

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African lymphoma

see burkitt's lymphoma.

angiotropic large-cell lymphoma

an uncommon form of the disease seen rarely in dogs; lesions most commonly in the lungs producing a syndrome similar in many ways to congestive heart failure.

bovine malignant lymphoma

the tumor form of bovine viral leukosis.

Burkitt's lymphoma

see burkitt's lymphoma.

canine malignant lymphoma

the commonest hemopoietic neoplasm of dogs. It is characterized by lymphoid tumors in multiple lymph nodes, spleen, liver or other organs. Lymphocytic leukemia with involvement of bone marrow is much less common.

cutaneous lymphoma

round, raised cutaneous nodules or plaques caused by the infiltration of neoplastic lymphocytes with a tropism for epithelial cells. Occurs in cattle, dogs and humans. See also mycosis fungoides.

follicular lymphoma

a malignant lymphoma in which the lymphomatous cells are in clusters in the lymph node resembling follicles. Called also giant follicular lymphoma, nodular lymphoma.

giant follicular lymphoma

see follicular lymphoma (above).

Hodgkin's type lymphoma

rare, but reported most frequently in the dog. A diagnosis depends on the identification of the Reed-Sternberg cell in a mixed population of lymphocytes accompanied by sclerosis.

immunoblastic lymphoma

may be nonsecretory or may secrete immunoglobulins. See also myeloma.

large cell lymphoma

classified as diffuse, large cells, large cell immunoblastic or mixed tumors with large cells.

lymphoblastic lymphoma

tumors of medium-sized lymphocytes or small noncleaved lymphocytes.

malignant lymphoma (histiocytic)

a form in which the predominant cell is the prolymphocyte (reticulum cell).

malignant lymphoma (mixed cell)

a form containing proliferations of both prolymphocytes and lymphocytes.

malignant lymphoma (poorly differentiated lymphocytic)

a form in which the predominant cell is morphologically similar to the lymphoblast, containing a fine nuclear chromatin structure and one or more nucleoli.

malignant lymphoma (small cell lymphocytic, small cleaved cell, well-differentiated lymphocytic)

the form in which the predominant cell is the mature lymphocyte.

malignant lymphoma (undifferentiated)

a form in which relatively large stem cells with large nuclei, pale, scanty cytoplasm and indistinct borders predominate.

nodular lymphoma

see follicular lymphoma (above).

T cell lymphoma

a form in which the predominant cell is the mature lymphocyte.

thymic lymphoma

occurs most commonly in yearling cattle and cats. In cattle, it causes obstruction of the esophagus leading to ruminal tympany, engorgement of jugular veins and edema of brisket and submandibular space. In cats it is caused by feline leukemia virus infection and is usually associated with pleural effusion and accompanying dyspnea and regurgitation.