12-04-2008, 08:03 PM
A 4-year-old boy is being evaluated for renal calculi. Urinalysis shows numerous hexagonally shaped crystals. Urine concentrations of several amino acids, including ornithine, arginine, and lysine, are increased. Which of the following is the most likely predominant component of the crystals?
A. Calcium oxalate
B. Cholesterol
C. Cystine
D. Struvite
E. Uric acid
A. Calcium oxalate
B. Cholesterol
C. Cystine
D. Struvite
E. Uric acid