Kayser Fleischer ring is seen in
**Core Concept**
Kayser-Fleischer ring is a medical sign characterized by a brownish-yellow or golden ring at the edge of the cornea, resulting from the deposition of copper in the Descemet's membrane. This condition is associated with Wilson's disease, a genetic disorder leading to copper accumulation in various tissues.
**Why the Correct Answer is Right**
Kayser-Fleischer ring is a hallmark of Wilson's disease, where the body fails to eliminate excess copper due to mutations in the ATP7B gene. The copper accumulates in the liver, brain, and other organs, including the cornea, leading to the formation of the Kayser-Fleischer ring. The ring is formed due to the deposition of copper in the Descemet's membrane, a thin layer of tissue in the cornea.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Kayser-Fleischer ring is not typically seen in primary biliary cirrhosis, although copper accumulation can be observed in the liver.
**Option B:** This option is incorrect because hemochromatosis is a disorder of iron accumulation, not copper.
**Option C:** This option is incorrect because primary sclerosing cholangitis is a chronic liver disease, but it is not associated with Kayser-Fleischer ring.
**Clinical Pearl / High-Yield Fact**
Kayser-Fleischer ring is a critical diagnostic clue for Wilson's disease, and its presence should prompt further investigation, including genetic testing and liver function tests.
**Correct Answer: B, Hemochromatosis is not the correct answer though, the question likely has a different answer.**