During neonatal assessment, recognizing specific patterns of congenital anomalies is essential to identify the underlying teratogenic insult. Match each distinct dysmorphic clinical presentation to the maternal exposure most likely responsible.
- A neonate presents with microcephaly, a wide anterior fontanelle, cleft lip, and pronounced hypoplasia of the distal phalanges and nails.In utero phenytoin exposure
- An infant is born with severe nasal hypoplasia resulting in a depressed nasal bridge; skeletal radiographs demonstrate characteristic stippled epiphyses.In utero warfarin exposure
- A newborn is evaluated for profound bilateral microtia, a conotruncal cardiac defect, and absent thymic tissue leading to early hypocalcemia.In utero isotretinoin exposure
- A term infant is noted to have microcephaly, short palpebral fissures, a smooth and indistinct philtrum, and a remarkably thin upper lip vermilion border.In utero alcohol exposure
- A neonate is born with a lumbar myelomeningocele, secondary hydrocephalus, and characteristic facial features including a broad nasal root.In utero valproate exposure
Cevap
Phenytoin causes distal phalangeal hypoplasia; Warfarin causes stippled epiphyses; Isotretinoin causes microtia and thymic aplasia; Alcohol causes a smooth philtrum and thin vermilion border; Valproate causes neural tube defects.
Each specific teratogen disrupts distinct embryological pathways, leading to classic, recognizable physical findings in the neonate. Accurate matching relies on identifying the pathognomonic triad or tetrad of dysmorphic features associated with each exposure.
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Anahtar Kavram
Identifying specific teratogenic syndromes based on their unique dysmorphic and structural anomaly patterns in neonates.
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