Which features are characteristic of Treacher Collins syndrome?

Which features are characteristic of Treacher Collins syndrome?

• A. Hearing loss and hypertelorism
• B. Anti-mongoloid slant, underdevelopment of the zygomatic area, micrognathia
• C. Facial asymmetry and cleft lip
• D. Proptosis and large calvaria

Answer: (B)

Treacher Collins syndrome, also known as mandibulofacial dysostosis, is a genetic disorder characterized by defects in the development of bones and tissues of the face. The features associated with this syndrome primarily include underdevelopment of facial structures, particularly those of the zygomatic region and mandible. The condition is often characterized by a notable anti-mongoloid slant of the palpebral fissures, indicating the orientation of the eyes, along with micrognathia, which refers to a smaller-than-normal jaw. Additionally, the zygomatic area is typically underdeveloped, resulting in a flat facial profile. This triad of features—zygomatic underdevelopment, anti-mongoloid slant, and micrognathia—are hallmark indicators that assist in diagnosing Treacher Collins syndrome. Collectively, these characteristics help to differentiate it from other craniofacial conditions, especially since they highlight the typical facial dysmorphism found in affected individuals. While other choices mention features that can occur in various conditions, they do not specifically encapsulate the key traits of Treacher Collins syndrome as effectively as the selected answer does.

Treacher Collins syndrome, also known as mandibulofacial dysostosis, is a genetic disorder characterized by defects in the development of bones and tissues of the face. The features associated with this syndrome primarily include underdevelopment of facial structures, particularly those of the zygomatic region and mandible. The condition is often characterized by a notable anti-mongoloid slant of the palpebral fissures, indicating the orientation of the eyes, along with micrognathia, which refers to a smaller-than-normal jaw.

Additionally, the zygomatic area is typically underdeveloped, resulting in a flat facial profile. This triad of features—zygomatic underdevelopment, anti-mongoloid slant, and micrognathia—are hallmark indicators that assist in diagnosing Treacher Collins syndrome. Collectively, these characteristics help to differentiate it from other craniofacial conditions, especially since they highlight the typical facial dysmorphism found in affected individuals.

While other choices mention features that can occur in various conditions, they do not specifically encapsulate the key traits of Treacher Collins syndrome as effectively as the selected answer does.