A 6-Year-Old Boy With Excessive Fidgeting*
A 6-year-old boy is brought to the office by his mother for a follow-up medical examination. He currently takes methylphenidate for attention deficit hyperactivity disorder. The boy’s paternal uncle and grandfather have an unknown movement disorder. His mother mentions that, despite the use of medication, the boy is constantly fidgeting and imitating her.
Physical examination showed an elevated frequency of eye blinking, repetitive frowning of his forehead, and large amplitude head shaking to one side. All of these movements subside when the boy speaks or clears his throat. Laboratory studies and EEG show no abnormalities.
Which of the following is the most likely cause of this boy’s condition?
A. Huntington disease
B. Myoclonic dystonia
C. Rett syndrome
D. Tic disorder
E. Young-onset Parkinson disease
Answer to be disclosed shortly!
*The present case has been reported in Medscape