This is part two of a two part case; the first part is the last post.
After making the timely diagnosis on your three year old patient, you admit him to the hospital and begin treatment. That night, you are called because the child has a seizure. The nurse reports some nausea and vomiting followed by anorexia, lethargy, and muscle cramps. You draw some labs and find an elevated serum uric acid, elevated serum potassium, and low serum calcium.
Challenge: What's going on?