Match each pediatric clinical presentation with the most likely underlying genetic or metabolic disorder.
- A child with tall stature, long thin fingers, downward lens dislocation, intellectual disability, and a recent deep vein thrombosis.Homocystinuria
- An infant with progressive developmental regression, a cherry-red macular spot, marked hepatosplenomegaly, and areflexia.Niemann-Pick disease
- A young boy with choreoathetosis, spasticity, severe developmental delay, and compulsive biting of his own lips and fingers.Lesch-Nyhan syndrome
- A toddler with intellectual disability, unusually fair skin and hair, a generalized eczematous rash, and a musty body odor.Phenylketonuria
Cevap
The presentations match as follows: the patient with thrombosis and downward lens dislocation has Homocystinuria; the infant with a cherry-red spot, areflexia, and hepatosplenomegaly has Niemann-Pick disease; the boy with self-mutilation has Lesch-Nyhan syndrome; and the toddler with a musty odor and fair skin has Phenylketonuria.
Each vignette provides classic findings that are highly specific to one metabolic disorder. Homocystinuria is distinguished by the combination of marfanoid features, hypercoagulability, and downward lens dislocation. Niemann-Pick disease is identified by sphingomyelin accumulation leading to hepatosplenomegaly, areflexia, and a cherry-red macula. Lesch-Nyhan syndrome is uniquely characterized by severe self-injurious behavior alongside choreoathetosis and spasticity. Phenylketonuria causes decreased melanin synthesis (resulting in fair skin and hair) and a musty body odor due to phenylacetate accumulation.
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Anahtar Kavram
Recognizing the pathognomonic clinical features of pediatric metabolic and genetic disorders is essential for accurate clinical differentiation and diagnosis.