A 22-year-old man has features of arm span greater than height, subluxated lenses, flattened and dilation of the aortic most likely diagnosis is?
**Core Concept**
The underlying condition being tested involves a genetic disorder affecting connective tissue, leading to **skeletal, ocular, and cardiovascular manifestations**. This condition is characterized by **marfanoid habitus**, which includes an arm span greater than height, and other specific features such as subluxated lenses and aortic dilatation.
**Why the Correct Answer is Right**
The correct diagnosis is based on the combination of clinical features presented, including arm span greater than height, subluxated lenses, and aortic dilatation, which are hallmark signs of **Marfan syndrome**. This condition is caused by mutations in the **FBN1 gene**, leading to the production of abnormal **fibrillin-1**, a protein essential for the formation of elastic fibers found in connective tissue.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because, while it may share some features with Marfan syndrome, it does not fully account for the specific combination of symptoms presented.
**Option B:** This option is incorrect as it typically presents with different clinical features.
**Option C:** This choice is also incorrect as it does not align with the described symptoms.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **Marfan syndrome** is a genetic disorder that affects the body's connective tissue, leading to a range of complications, including **aortic aneurysm and dissection**, which are major contributors to morbidity and mortality in these patients.
**Correct Answer:** D. Marfan Syndrome