**Question:** All are true about Klippel-Feil syndrome EXCEPT:

A. Short neck and restricted cervical range of motion
B. Cleft palate and polydactyly
C. Low set ears
D. Osteoarthritis

**Core Concept:** Klippel-Feil syndrome is a congenital disorder characterized by fusion of cervical vertebrae, leading to short neck, limited neck mobility, and possibly associated anomalies.

**Why the Correct Answer is Right:** Klippel-Feil syndrome is caused by a reduction or absence of cervical vertebrae, resulting in short neck and restricted cervical range of motion. The correct answer (D) mentions osteoarthritis, which is a consequence of the Klippel-Feil syndrome but not a unique feature of the condition itself.

**Why Each Wrong Option is Incorrect:**

A. Short neck and restricted cervical range of motion are correct and are considered hallmark symptoms of Klippel-Feil syndrome.
B. Cleft palate and polydactyly (additional fingers or toes) are not typical findings in Klippel-Feil syndrome. They are associated with other conditions like Ectodermal dysplasia and Polydactyly, respectively.
C. Low set ears is not a unique feature of Klippel-Feil syndrome and can be seen in other congenital anomalies as well.

**Clinical Pearl:** Klippel-Feil syndrome is a rare congenital disorder affecting about 1 in 40,000 births. It is essential to recognize the core symptoms (short neck, limited cervical range of motion) to avoid misdiagnosis and unnecessary investigations. A thorough physical examination and knowledge of associated anomalies are crucial for accurate diagnosis.