A 10-year-old boy is presented to ophthalmology OPD for white ring around the black of the eye. His father died of coronary heart disease. O/E Corneal arcus is found, xanthoma on Achilles tendon. His fasting blood cholesterol >300 mg/dl, Triglycerides within normal limit. What is the diagnosis?
A 10-year-old boy is presented to ophthalmology OPD for white ring around the black of the eye. His father died of coronary heart disease. O/E Corneal arcus is found, xanthoma on Achilles tendon. His fasting blood cholesterol >300 mg/dl, Triglycerides within normal limit. What is the diagnosis?
💡 Explanation
## **Core Concept**
The question describes a clinical presentation suggestive of a specific type of hyperlipidemia. The key features include corneal arcus, xanthomas on the Achilles tendon, significantly elevated fasting blood cholesterol levels, and normal triglyceride levels in a young patient with a family history of coronary heart disease.
## **Why the Correct Answer is Right**
The combination of corneal arcus, tendon xanthomas (specifically on the Achilles tendon), and markedly elevated cholesterol levels (>300 mg/dl) with normal triglycerides is highly suggestive of **Familial Hypercholesterolemia (FH)**. This condition is characterized by very high levels of low-density lipoprotein cholesterol (LDL-C) due to mutations in the LDL receptor gene or genes involved in the LDL receptor pathway. The presence of corneal arcus and tendon xanthomas are physical examination findings commonly associated with FH. The significant family history of coronary heart disease further supports this diagnosis, as FH leads to premature atherosclerotic cardiovascular disease.
## **Why Each Wrong Option is Incorrect**
- **Option A:** Without specific details on the options, we can infer based on common conditions related to hyperlipidemia. Conditions like **Familial Combined Hyperlipidemia** typically present with elevated cholesterol and triglycerides, not matching this patient's profile.
- **Option B:** Similarly, **Hypertriglyceridemia** would primarily show elevated triglycerides, which is not the case here.
- **Option C:** This could potentially be a distractor related to other forms of hyperlipidemia or lipid disorders not specifically matching the described presentation.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that **Familial Hypercholesterolemia** is a significant cause of premature coronary artery disease. Early diagnosis and treatment, including lifestyle modifications and lipid-lowering therapies (e.g., statins, ezetimibe, PCSK9 inhibitors), are crucial to prevent or delay cardiovascular events. Recognizing physical signs like corneal arcus and tendon xanthomas can lead to earlier diagnosis.