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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 50 year old male presented with symptoms of cutaneous vasculitis, glomerulonephritis and synovitis. Which of the following investigations will be helpful in the diagnosis?
assistant
The correct answer is  Essential mixed cryoglobulinemia: Formation of immune complexes (IgM -IgG) Development of renal lesions and involvement of joints (MPGN I and synovitis) Most cases have been associated with hepatitis C virus infection. Deposits of IgG-IgM complexes induce Cutaneous vasculitis Synovitis MPGN