Constipated plasma cells associated with monomeric macroglobulinemia

Area of Science:

• Immunology
• Hematology
• Pathology

Background:

• Low molecular weight macroglobulinemia is a rare condition.
• Chronic pulmonary infections can trigger immune responses.

Purpose of the Study:

• To investigate the cause of low molecular weight macroglobulinemia in a patient with chronic pulmonary infection.
• To explore the relationship between plasma cell abnormalities and immunoglobulin production.

Main Methods:

• Case study of a patient with chronic pulmonary infection and low molecular weight macroglobulinemia.
• Histopathological examination of an enlarged cervical lymph node.
• Analysis of plasma cell morphology and immunoglobulin content.

Main Results:

• Abnormal plasma cells distended with immunoglobulin were found in the cervical lymph node.
• These cells appeared to release immunoglobulin into lymph spaces upon bursting.
• Macroglobulin production was considered a reactive immune response to the pulmonary infection.

Conclusions:

• The observed macroglobulinemia is likely a non-neoplastic immune response to chronic pulmonary infection.
• An acquired defect in macroglobulin polymerization may explain the presence of 7s-IgM and "constipated" plasma cells.