The characteristic triad of Klippel -Fell syndrome includes all of the following, Except –
**Core Concept**
Klippel-Feil syndrome is a rare congenital disorder characterized by the fusion of any two of the seven cervical vertebrae, leading to a short neck and potential complications such as neurological deficits, scoliosis, and respiratory problems. The syndrome can also be associated with other congenital anomalies.
**Why the Correct Answer is Right**
The characteristic triad of Klippel-Feil syndrome includes a short neck, low posterior hairline, and limited neck mobility. The fusion of cervical vertebrae leads to a restriction in neck movement, which is a key feature of the syndrome. This limited mobility is due to the abnormal development of the cervical spine, resulting in a shorter neck and a lower hairline.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it is not a part of the characteristic triad of Klippel-Feil syndrome. While scoliosis can be associated with the syndrome, it is not a defining feature.
* **Option B:** This option is incorrect as it is not a part of the characteristic triad of Klippel-Feil syndrome. While neurological deficits can occur due to the fusion of cervical vertebrae, they are not a specific feature of the triad.
* **Option D:** This option is incorrect as it is not a part of the characteristic triad of Klippel-Feil syndrome. While respiratory problems can occur due to the fusion of cervical vertebrae, they are not a specific feature of the triad.
**Clinical Pearl / High-Yield Fact**
Klippel-Feil syndrome is often associated with other congenital anomalies, such as Sprengel's deformity (elevated scapula), and can be part of various genetic syndromes, making a thorough physical examination and genetic evaluation essential for diagnosis.
**Correct Answer:** A.