A new form of alpha-chain disease with generalized lymph node involvement.

An autopsy case of alpha-chain disease (ACD) clinically manifesting generalized lymph node swelling, slight splenomegaly and long-standing ichthyosiform skin eruptions, was reported. Autopsy revealed systemic superficial and profound lymph node swelling and slight splenomegaly, but little or no tumorous lesion in any part of the alimentary tract or pulmonary tissue. The histologic picture of the lymph nodes showed a diffuse monomorphic plasmocytic lymphoma, and there was tumor cell infiltration in the spleen and bone marrow. Immunohistochemistry demonstrated that the tumor cells contained IgA devoid of light chains, i.e. ACD protein. Immunoelectron microscopy revealed that this abnormal immunoglobulin was localized in the rough endoplasmic reticulum and perinuclear space. Persistent chronic inflammation with infiltration mainly of helper-inducer T cells were found in the skin and dermatopathic lymphadenopathy was confirmed in the lymph node biopsies. From these peculiar clinicopathological features, this case is considered to be a previously unknown form of ACD.