37 degrees CE rosettes in various malignant and non-malignant disorders.

T lymphocytes, forming sheep erythrocyte rosettes at 37 degrees C, have been described in thymus glands, mitogen and allogeneic cell stimulated lymphocyte cultures, and acute T cell lymphoblastic leukaemia. This paper describes the finding of such lymphocytes in lymph nodes of a variety of disorders including Hodgkin's disease, Lennert's lymphoma, malignant lymphoma of large transformed T lymphocytes, immunoblastic lymphadenopathy, metastatic carcinoma, and other disorders. A large number of tonsils, but not reactive lymph nodes, also contained a significant number of those T lymphocytes. The significance of these findings in relation to interpretation of immune red cell rosettes and to the subclasses of T lymphocytes is discussed.