Which tissue is NOT a typical site for uric acid crystal deposition?

Which tissue is NOT a typical site for uric acid crystal deposition?

• A. Joints
• B. Kidneys
• C. Liver
• D. Brain

Answer: (C)

Uric acid crystals form when urate concentrations become high enough to exceed solubility, and they tend to deposit where extracellular fluids are exposed to high urate levels, such as the joints (gout) and the kidneys (urate stones or nephropathy). The brain isn’t a typical site because the blood-brain barrier limits urate access and the brain’s environment isn’t prone to crystallization. The liver, while it produces uric acid from purines, isn’t a place where crystals commonly deposit; crystals form in joints or urine, not in liver tissue. Therefore, the tissue that does not typically host uric acid crystal deposition is the liver.

Uric acid crystals form when urate concentrations become high enough to exceed solubility, and they tend to deposit where extracellular fluids are exposed to high urate levels, such as the joints (gout) and the kidneys (urate stones or nephropathy). The brain isn’t a typical site because the blood-brain barrier limits urate access and the brain’s environment isn’t prone to crystallization. The liver, while it produces uric acid from purines, isn’t a place where crystals commonly deposit; crystals form in joints or urine, not in liver tissue. Therefore, the tissue that does not typically host uric acid crystal deposition is the liver.