Immunohistochemical study of primary extranodal malignant non-Hodgkin's lymphoma

Between 1996 and 1998, 31 cases of primary extranodal malignant non-Hodgkin's lymphoma were studied immunohistochemically. Immunohistochemical study showed that the majority of the cases were of B-cell type: 19 cases (73.07%) and only 3 cases (11.53%) were of the T-cell type. According to the Working Formulation system, the most common histologic type was diffuse, large cell type (61.29%). The histologic grade was moderate grade: 23 cases (74.19%), high grades: 5 cases (16.13%).