Overview
Aprosencephaly/atelencephaly spectrum encompasses severe malformations of the brain, often presenting with significant neurological deficits and associated craniofacial anomalies. These conditions represent extreme forms of neural tube defects, affecting brain development and structure profoundly 45.Diagnosis
Key Diagnostic Criteria:
- Severe reduction or absence of cerebral hemispheres (aprosencephaly/atelencephaly) 4.
- Associated craniofacial anomalies, including facial asymmetry, microphthalmia, and ocular abnormalities 23.
Recommended Tests:
- Neuroimaging (MRI/CT) to assess brain structure 4.
- Biochemical assays for peroxisomal function (pipecolic acid, VLCFA, bile acid precursors) in suspected cerebrohepatorenal syndrome 45.
Grading:
- Clinical and imaging findings are definitive 4.
- Biochemical markers confirm specific peroxisomal disorders 45.Management
First-Line Treatments:
- Supportive care focusing on respiratory, feeding, and neurological management 4.
- Early intervention programs for developmental support 4.
Adjunctive Treatments:
- No specific pharmacological treatments are mentioned for aprosencephaly/atelencephaly 45.
- Nutritional supplementation (choline, folic acid, Vitamin D) may support general fetal development in prevention contexts 1.Special Populations
Pregnancy:
- Micronutrient supplementation (choline, folic acid, Vitamin D) may mitigate risks associated with fetal brain development 1.
Pediatrics:
- Comprehensive multidisciplinary care teams essential for managing complex needs 4.
Comorbidities:
- Hemifacial microsomia and other craniofacial anomalies may coexist, requiring specialized reconstructive surgery 23.Key Recommendations
Utilize neuroimaging for definitive diagnosis of aprosencephaly/atelencephaly (Evidence: Strong 4).
Consider biochemical testing for peroxisomal disorders in cases with overlapping features (Evidence: Moderate 45).
Implement supportive care and early intervention programs tailored to developmental needs (Evidence: Expert opinion 4).
Promote maternal micronutrient supplementation during pregnancy to potentially support fetal brain development (Evidence: Moderate 1).References
1 Freedman R, Hunter SK, Law AJ, Clark AM, Roberts A, Hoffman MC. Choline, folic acid, Vitamin D, and fetal brain development in the psychosis spectrum. Schizophrenia research 2022. link
2 Ming JE, Katowitz J, McDonald-McGinn DM, Schnur RE, Hunter JV, Zackai EH. Hemifacial microsomia in a newborn with hypoplastic skin lesions, an eyelid skin tag, and microphthalmia: an unusual presentation of Delleman syndrome. Clinical dysmorphology 1998. link
3 Stoll C, Viville B, Treisser A, Gasser B. A family with dominant oculoauriculovertebral spectrum. American journal of medical genetics 1998. link1096-8628(19980724)78:4<345::aid-ajmg8>3.0.co;2-k)
4 Kaplan M, Eidelman AI, Shapira Y, Collins J, Goldfischer S. Cerebrohepatorenal syndrome of Zellweger: a peroxisomal deficiency disorder. Case report and review. Israel journal of medical sciences 1988. link
5 Govaerts L, Monnens L, Tegelaers W, Trijbels F, van Raay-Selten A. Cerebro-hepato-renal syndrome of Zellweger: clinical symptoms and relevant laboratory findings in 16 patients. European journal of pediatrics 1982. link