Case Report
Multiple Myeloma Mimicking a Small Vessel Vasculitis Presentation
Table 1
Test results of the approach.
| Test performed | Test result | Normal range |
| Rheumatoid factor | 8.6 UI/mL | 0–12 UI/mL | Complement C3 levels | 127 mg/dL | 88–165 mg/dL | Complement C4 levels | 34 mg/dL | 14–44 mg/dL | Antinuclear antibodies | Negative | Negative | Anti-DNA antibodies | Negative | Negative | Extractable nuclear antigens: Ro, La, Sm, and RNP | 0.2, 0.1, 0.1, and 0, respectively | 0–0.9 | C-ANCA | Negative | Negative | P-ANCA | Negative | Negative | HIV serology | Nonreactive | Nonreactive | Hepatitis B and C serology | Nonreactive | Nonreactive | Rapid plasma reagin | Nonreactive | Nonreactive | 24-hour urine test | Creatinine clearance 42 mg/24 h | 0.04–0.24 gr/24 h | Proteins in urine 12 gr/24 h | Albumin | 4.2 gr/dL | 3.5–5 gr/dL | Antiphospholipid antibodies: Anticardiolipin IgG and IgM, lupus anticoagulant, β2GP, IgG, and IgM | Negative | Negative | Cryoglobulins | Negative | Negative | Transthoracic echocardiography | There were no vegetations, cardiac tumor or other sources of emboli. Left ventricular ejection fraction 65% | — | Renal ultrasonography | No abnormalities | — | Thoracic X-ray | Normal | — |
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