Subacute bacterial endocarditis masquerading as type III essential mixed cryoglobulinemia

Area of Science:

• Nephrology
• Rheumatology
• Infectious Diseases

Background:

• Cryoglobulinemia is a rare condition involving abnormal proteins in the blood.
• Vasculitis and kidney impairment are serious manifestations of cryoglobulinemia.

Observation:

• A patient with suspected essential type III cryoglobulinemia showed initial improvement with immunosuppressants.
• Vasculitis recurred upon reducing immunosuppressive therapy, and further intensification worsened the patient's condition.

Findings:

• Re-evaluation revealed bacterial endocarditis as the underlying cause of type III cryoglobulinemia.
• Discontinuation of immunosuppressants and initiation of antibiotics led to complete resolution of symptoms.

Implications:

• This case highlights the critical need to rule out infectious etiologies in cryoglobulinemia.
• An initial positive response to immunosuppressive therapy does not preclude an underlying infection.