Xanthinuria Overview Xanthinuria is a rare genetic disorder characterized by a deficiency in the enzyme xanthine dehydrogenase/oxidase (XDH/XO), resulting in high xanthine levels and low uric acid in blood/urine. It often causes xanthine kidney stones, renal failure, and sometimes muscle pain, though many cases are asymptomatic Symptoms Kidney Stones (Xanthine Urolithiasis): The most common symptom, occurring in about 50% of patients. Hematuria: Blood in the urine. Urinary Tract Infections: Recurrent infections. Renal Issues: Acute renal failure, renal colic, and in rare cases, chronic kidney failure. Muscle Symptoms : Muscle pain and cramping (myalgia/arthropathy). Other Symptoms: Irritability, vomiting, and failure to thrive (particularly in children). Asymptoma tic: Some individuals, roughly 20%, may not experience any symptoms Causes Type I Xanthinuria: Caused by a mutation in the XDH gene alone, leading to deficiency of the xanthine dehydrogenase enzyme. Type II Xa...
Xanthelasma Overview Xanthelasma (cholesterol deposits) under the skin around the eyes. Xanthelasma, or cholesterol deposits, under the skin. What is xanthelasma? Xanthelasma, or xanthelasma palpebrarum (XP), is a harmless, yellow growth that appears on or by the corners of your eyelids next to your nose. Cholesterol deposits build up under your skin to form a xanthelasma. Having xanthelasmas could be a sign of another condition, such as: Diabetes. Hyperlipidemia (high cholesterol). Thyroid problems. Researchers have found that having xanthelasmas means it’s very likely that you’ll have these conditions in the future: Heart disease. Heart attack. Atherosclerosis (even if your cholesterol levels are normal). High cholesterol. Who does xanthelasma affect? Half of the people with xanthelasmas have high cholesterol levels. Healthcare providers usually see these levels in people with the kind of high cholesterol you get from your parents or some liver diseases. However, the other 50% of peo...