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Symmetrical thalamic lesions in infants.
Archives of Disease in Childhood
|January 1, 1992
Summary
Symmetrical thalamic lesions (STL) in newborns present with severe neurological deficits and often result in death. Early detection through imaging may indicate a prenatal hypoxic-ischemic event.
Area of Science:
- Neonatal Neurology
- Pediatric Neuroradiology
- Developmental Neuroscience
Background:
- Symmetrical thalamic lesions (STL) are a rare condition affecting newborns.
- Understanding the etiology and clinical presentation of STL is crucial for early diagnosis and management.
Observation:
- Clinical signs include absent primitive reflexes, spasticity at birth, and lack of psychomotor development.
- Imaging often reveals bilateral thalamic calcifications, detectable via computed tomography or cranial ultrasound.
- Polyhydramnios and absent suck/swallow reflexes are frequently observed antenatally and neonatally.
Findings:
- Postmortem examinations confirm neuronal loss, astrogliosis, and 'incrusted' neurons, predominantly in the thalamus.
- Lesions can extend to the basal ganglia and brain stem in a significant proportion of cases.
- Absence of perinatal asphyxia suggests a prenatal origin for the insult.
Implications:
- A hypoxic-ischemic event occurring 2-4 weeks prior to birth is the most likely cause of STL.
- The presence of thalamic calcifications and spasticity at birth suggests the insult occurred at least 2-4 weeks before delivery.
- STL may be underdiagnosed due to its rarity and subtle initial presentation, highlighting the need for increased awareness among clinicians and radiologists.