Cryoglobulinemia typically presents with which cluster of features?

• A. Hematuria with red cell casts
• B. Isolated peripheral edema
• C. Palpable purpura, arthritis, neuropathy, and digital ischemia
• D. Hypertension with proteinuria only

Answer: (C)

Cryoglobulinemia is an immune complex–mediated vasculitis that classically affects small vessels, leading to a multi-system pattern. The most characteristic cluster includes skin involvement with palpable purpura from leukocytoclastic vasculitis, joint involvement causing arthralgia or arthritis, nerve involvement causing neuropathy, and vascular compromise in the digits leading to digital ischemia. This combination reflects the typical way cryoglobulinemic vasculitis manifests: immune complex deposition in skin, nerves, and small vessels of the extremities, often in the setting of conditions like Hepatitis C. Other patterns such as isolated hematuria with red cell casts or isolated edema or hypertension with proteinuria alone don’t capture this specific vasculitic syndrome, which is why the combination of purpura, arthritis, neuropathy, and digital ischemia is the best fit.