Polyclonal hyperviscosity syndrome (HVS) is rare and has been reported in various disorders of immune dysregulation and lymphoid hyperplasia. IgG4-Related Disease (IgG4-RD) is an emerging disorder often associated with exuberant hypergammaglobulinemia, and this review of seven cases establishes IgG4-RD as an important cause of polyclonal HVS.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4405305PMC
http://dx.doi.org/10.1002/ccr3.201DOI Listing

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