In plasma cell myeloma, the erythrocytes have a distinct abnormality in the peripheral blood. Which of the following is that abnormality?

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In plasma cell myeloma, erythrocytes have a tendency to form stacks known as rouleaux formation. This occurs due to increased plasma proteins, particularly immunoglobulins, which cause red blood cells to stick together in a linear formation. Moth-eaten appearance, agglutinates, and polychromasia are not characteristic findings in plasma cell myeloma.

In Plasma Cell Myeloma, the Erythrocytes Have a Distinct Abnormality