What typical physical examination finding would you expect in a patient with fragile X syndrome?

• A. Long face
• B. Short stature
• C. Joint hypermobility
• D. Postpubertal gynecomastia

Answer: (A)

In a patient with fragile X syndrome, a long face is a characteristic physical examination finding. This distinctive feature is often accompanied by other facial anomalies, such as a prominent forehead, large ears, and a prominent jaw. These features arise due to the genetic changes caused by the mutation in the FMR1 gene, which affects the development of facial structures.

The association of a long face with fragile X syndrome is significant because it assists in the clinical recognition of the condition, particularly in a pediatric setting. Other common signs of fragile X syndrome include developmental delays and learning disabilities, but the physical features play a crucial role in the diagnosis.

The other options, while they may present in various syndromes or conditions, are not typical findings associated with fragile X syndrome specifically. Short stature can occur in several syndromes but is not a hallmark of fragile X. Joint hypermobility is seen in connective tissue disorders and not specifically fragile X. Postpubertal gynecomastia may be observed in some genetic conditions but is not a defining characteristic of fragile X syndrome. Thus, the prominent and long face stands out as a key feature in fragile X syndrome.