Abstract
The diagnosis of immunoglobulin M (IgM) paraproteinemia and AL amyloidosis is rare, representing 5 to 7% of the cases. IgM monoclonal gammopathy of undetermined significance (MGUS) differs from other MGUS forms due to the distinctive properties of IgM molecules, which exhibit high intrinsic viscosity and precipitate more readily than other immunoglobulin types, leading to unique clinical cases.
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