Immunoblastic lymphadenopathy-like T-cell lymphoma with multiple cutaneous and visceral involvements.

Morphologic and immunological findings found in a patient with immunoblastic lymphadenopathy (IBL)-like T-cell lymphoma (IBL-T) are presented. Though the initial clinical features were suggestive of IBL, multiple cutaneous and visceral tumors appeared later in his course. The cutaneous lesion is considered to be unique, because the neoplastic T cells with suppressor/cytotoxic (S/C) phenotype showed focal epidermotropism, resulting in necrosis and ulceration of the overlying epidermis. An interesting feature in IBL-T is the frequent association of polyclonal hypergammaglobulinemia, yet the neoplastic T cells show S/C phenotype. Since Ia-like antigen was expressed on the neoplastic T cells, it is stressed that antigen-presenting and contrasuppressor cells should also be included in the cell populations which have a possibility to be a normal counterpart of IBL-T.