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A 9-year-old male adopted from foster care at age 3 is brought for psychiatric evaluation by his adoptive parents due to behavioral difficulties at school including impulsivity, difficulty following multi-step instructions, poor social judgment, and frequent disciplinary referrals. He was previously diagnosed with ADHD at age 6 and treated with methylphenidate, which provided minimal improvement. His adoptive parents report that he is 'friendly to everyone' including strangers, has difficulty understanding consequences of his actions, and struggles with abstract concepts despite adequate concrete reasoning abilities. His biological mother's history includes polysubstance use during pregnancy, though specific substances are unknown. On examination, he is below the 10th percentile for height and head circumference, has a smooth philtrum, thin upper lip vermilion, and short palpebral fissures. His IQ testing reveals a full-scale IQ of 82 with significant discrepancy between verbal comprehension and working memory indices. Which assessment finding pattern most strongly supports fetal alcohol spectrum disorder over ADHD as the primary diagnosis?
Explanation
Fetal alcohol spectrum disorder diagnosis requires convergent evidence of the sentinel facial features (smooth philtrum, thin upper lip vermilion, short palpebral fissures), growth deficiency, and central nervous system dysfunction including the characteristic neurobehavioral profile. The neurocognitive pattern of FASD — impaired abstract reasoning with preserved concrete skills, indiscriminate social behavior, and poor consequential thinking — is qualitatively distinct from uncomplicated ADHD.
Key Takeaway
FASD is distinguished from ADHD by the triad of characteristic facial dysmorphology, growth deficiency, and a specific neurobehavioral profile including impaired abstract reasoning, indiscriminate social behavior, and difficulty understanding consequences that extends beyond the attentional deficits of ADHD.