Cryoglobulinaemia

Histologic Findings

Skin: Purpura are histologically characterized by dermal vasculitis that extends variably to the subcutaneous interstitial space. HCV-associated proteins have been found in vasculitic skin biopsy samples, suggesting a role for these antigens in pathogenesis of the lesions.

Other organs: Autopsy studies have revealed unsuspected vasculitis of multiple organs (heart, lung, gastrointestinal tract, central nervous system, liver, muscle, adrenals).¹⁴ Histologic evaluation of affected lung, kidney, and muscle reveals eosinophilic material in the lumen of small vessels with frequent extension into the vessel intima and inflammation of the vessel wall.³⁷

Although biopsy samples generally exhibit inflammatory vascular changes (eg, leukocytoclastic vasculitis in patients with vasculitic purpura), intraluminal cryoglobulin deposits may be observed, especially in renal glomeruli

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