Question:
A patient with chronic hepatitis C presents with palpable purpura and Raynaud’s phenomenon. Which of the following is the most likely diagnosis?
A patient with chronic hepatitis C presents with palpable purpura and Raynaud’s phenomenon. Which of the following is the most likely diagnosis?
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Always pair the viral hepatitis type with its classic vasculitis association: Hepatitis C = Mixed Cryoglobulinemia. Hepatitis B = Polyarteritis Nodosa (PAN). The presence of low C4 with normal C3 is an excellent laboratory clue for Cryoglobulinemia.
Updated On: Sep 3, 2026
- Mixed cryoglobulinemia
- Polyarteritis nodosa
- ANCA vasculitis
- Rheumatoid vasculitis
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The Correct Option is A
Solution and Explanation
Concept:
The clinical triad of palpable purpura, Raynaud's phenomenon, and a history of chronic Hepatitis C Virus (HCV) infection is the classic presentation of Mixed Cryoglobulinemia (Cryoglobulinemic Vasculitis).
Cryoglobulins are immunoglobulins that precipitate in the cold and dissolve upon rewarming.
Explanation:
• Mixed cryoglobulinemia (Types II and III) is strongly associated with chronic infections, predominantly Hepatitis C, which accounts for up to 80-90% of cases.
• Pathophysiology involves the continuous stimulation of B-cells by HCV, leading to the production of monoclonal IgM with rheumatoid factor activity (Type II) or polyclonal IgM (Type III). These form immune complexes with IgG and HCV RNA, which precipitate in small to medium-sized blood vessels, triggering complement activation and a systemic vasculitis.
• Clinical manifestations classically include Meltzer's triad: palpable purpura, arthralgia, and weakness. Raynaud's phenomenon, peripheral neuropathy, and membranoproliferative glomerulonephritis (MPGN) are also highly characteristic.
• Option (B), Polyarteritis nodosa (PAN), is a medium-vessel vasculitis that can cause purpura but is classically associated with Hepatitis B Virus (HBV), not HCV. It also does not typically present with Raynaud's phenomenon.
• Option (C), ANCA vasculitis, involves the respiratory tract and kidneys (pauci-immune glomerulonephritis) and is not primarily triggered by HCV.
• Option (D), Rheumatoid vasculitis, occurs in patients with severe, long-standing, seropositive Rheumatoid Arthritis, not typically driven by HCV.
Final answer:
The direct association between chronic Hepatitis C and small-vessel vasculitis presenting as palpable purpura and Raynaud's points definitively to Mixed cryoglobulinemia.
The clinical triad of palpable purpura, Raynaud's phenomenon, and a history of chronic Hepatitis C Virus (HCV) infection is the classic presentation of Mixed Cryoglobulinemia (Cryoglobulinemic Vasculitis).
Cryoglobulins are immunoglobulins that precipitate in the cold and dissolve upon rewarming.
Explanation:
• Mixed cryoglobulinemia (Types II and III) is strongly associated with chronic infections, predominantly Hepatitis C, which accounts for up to 80-90% of cases.
• Pathophysiology involves the continuous stimulation of B-cells by HCV, leading to the production of monoclonal IgM with rheumatoid factor activity (Type II) or polyclonal IgM (Type III). These form immune complexes with IgG and HCV RNA, which precipitate in small to medium-sized blood vessels, triggering complement activation and a systemic vasculitis.
• Clinical manifestations classically include Meltzer's triad: palpable purpura, arthralgia, and weakness. Raynaud's phenomenon, peripheral neuropathy, and membranoproliferative glomerulonephritis (MPGN) are also highly characteristic.
• Option (B), Polyarteritis nodosa (PAN), is a medium-vessel vasculitis that can cause purpura but is classically associated with Hepatitis B Virus (HBV), not HCV. It also does not typically present with Raynaud's phenomenon.
• Option (C), ANCA vasculitis, involves the respiratory tract and kidneys (pauci-immune glomerulonephritis) and is not primarily triggered by HCV.
• Option (D), Rheumatoid vasculitis, occurs in patients with severe, long-standing, seropositive Rheumatoid Arthritis, not typically driven by HCV.
Final answer:
The direct association between chronic Hepatitis C and small-vessel vasculitis presenting as palpable purpura and Raynaud's points definitively to Mixed cryoglobulinemia.
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