A 34-Year-Old Man Is Being Evaluated for Acute Hematuria and Oliguria

A 34-year-old man is being evaluated for acute hematuria and oliguria.  He has no chronic medical conditions and takes no medications on a regular basis.  Blood pressure is 170/100 mm Hg.  Blood urea nitrogen is 38 mg/dL and serum creatinine is 4.5 mg/dL.  The patient undergoes a kidney biopsy and the following microscopic changes are seen after silver staining to highlight the glomerular tuft: The area marked with an arrow is likely to have abnormal deposition of which of the following substances?

A) Amyloid
B) Fibrin
C) IgE
D) Lipid
E) Myoglobin

Correct Answer:

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