Which option is NOT a typical feature of Rett syndrome?

• A. Progressive neurological deterioration
• B. Seizure risk
• C. Scoliosis risk
• D. Early onset hearing loss

Answer: (D)

Rett syndrome is a neurodevelopmental disorder that follows a period of apparently typical early development, then regression with loss of purposeful hand skills, stereotypic hand movements, slowed head growth, and gait disturbances. As the condition progresses, seizures become more common and skeletal issues like scoliosis are a frequent complication due to neuromuscular impairment. Hearing impairment is not a defining or typical feature of Rett syndrome, even though individuals may have communication difficulties that affect how they respond to sound. Therefore, early onset hearing loss does not fit the characteristic pattern of Rett syndrome, making it the correct choice for what is not typical.