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Difficulty: MediumNormal Growth and Development

A 12-month-old male infant presents to the primary care office for a wellness evaluation. His parents report that he is generally healthy and they have no acute concerns. The patient was born at 40 weeks gestation via an uncomplicated vaginal delivery. Developmentally, he can sit without support, pull himself to a standing position, and cruise along furniture. He says "mama" and "dada" specifically to his parents and can successfully wave "bye-bye." While observing the patient playing on the examination table, the physician notes that he consistently uses a mature pincer grasp with his right hand to pick up small objects. His left hand remains largely clenched in a fist resting on his leg. Furthermore, when a toy is placed on his left side, he crosses his midline with his right hand to retrieve it. His height, weight, and head circumference are tracking consistently at the 60th percentile. Which of the following is the most appropriate next step in management?

  1. A
    Reassurance and observation at the next scheduled visit
  2. Referral for a comprehensive neurologic evaluationAnswer
  3. C
    Measurement of serum creatine kinase levels
  4. D
    Referral for formal audiologic testing
  5. E
    Administration of an autism-specific screening questionnaire

Answer

Referral for a comprehensive neurologic evaluation
The correct answer is referral for a comprehensive neurologic evaluation. In normal pediatric development, children utilize both hands equally and do not typically establish a clear hand preference until they are between 2 and 4 years old. When a strong hand preference is observed in an infant younger than 18 months, especially when accompanied by asymmetric motor signs such as a persistently fisted hand, it is a highly concerning "red flag." This clinical picture strongly suggests a unilateral upper motor neuron lesion on the contralateral side, such as hemiplegic cerebral palsy. The appropriate next step is a referral to a pediatric neurologist to confirm the diagnosis, arrange for neuroimaging, and coordinate physical and occupational therapies.

Step-by-Step Solution

1
Assess the patient's developmental milestones against normal 12-month benchmarks.
The infant's language, social, and gross motor milestones (cruising, specific "mama"/"dada", waving bye-bye) are normal for his age.
Establishing a baseline for global development helps isolate specific deficits.
2
Evaluate the clinical significance of the asymmetric fine motor findings (right hand preference, left hand fisted).
Hand preference typically does not emerge until 2 to 4 years of age. A strong hand preference before 18 months is a developmental red flag.
Early handedness indicates that the child is avoiding the use of the contralateral limb due to a focal neurologic deficit.
3
Determine the appropriate management for an infant presenting with signs of an upper motor neuron lesion.
The patient requires a formal referral to a pediatric neurologist for evaluation of possible hemiplegic cerebral palsy or other focal intracranial lesions.
Prompt evaluation is necessary to guide diagnostic imaging (such as a brain MRI) and to initiate targeted early intervention services.

Key Concept

Early hand preference (before 18 to 24 months of age) is a developmental red flag that suggests a focal neurologic deficit, such as hemiplegic cerebral palsy, and warrants a neurologic evaluation.
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Topics

Normal Growth and Development

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