Adams-Oliver syndrome
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A neonate is born with a large scalp defect at the vertex (aplasia cutis congenita) overlying a skull defect, absent terminal phalanges of the toes with stub-like digits, and a mottled vascular pattern on the skin (cutis marmorata). Echocardiogram shows a large ventricular septal defect with hypoplastic aortic arch.
Genetically heterogeneous. The AD and AR forms converge mechanistically on the Notch signaling pathway, the same developmental pathway that governs vasculogenesis, limb apical ectodermal ridge maintenance, and ectodermal patterning.
| Inheritance | Genes | Notes |
|---|---|---|
| AD | NOTCH1 | Highest cardiovascular risk; aortic valve disease, hypoplastic left heart |
| AD | DLL4 | Notch ligand |
| AD | RBPJ | Notch transcriptional effector |
| AD | ARHGAP31 | Cdc42/Rac1 GTPase regulator (signaling crosstalk with Notch) |
| AR | DOCK6 | Cdc42/Rac1 guanine nucleotide exchange factor; often more severe; CNS involvement common |
| AR | EOGT | O-GlcNAc transferase that modifies Notch1 |
Mechanistic theme: Notch signaling regulates the apical ectodermal ridge (AER) of the developing limb (→ terminal limb defects when disrupted) and vascular endothelial specification (→ scalp/skull defects from vascular failure of the developing scalp + cardiac defects).
Adams-Oliver is defined by the combination of aplasia cutis congenita (typically of the scalp vertex) plus terminal transverse limb defects in the same individual or close family members.
- Major criteria: scalp aplasia cutis congenita (often with skull defect), terminal transverse limb defects
- Minor criteria: cutis marmorata telangiectatica congenita, congenital heart defect, vascular anomaly elsewhere
- Aplasia cutis congenita (ACC) of the scalp vertex:
- Single or multiple lesions
- May be superficial (membranous) or full-thickness with underlying skull defect
- Risk of hemorrhage from exposed dural sinuses in larger defects
- Terminal transverse limb defects:
- Hypoplasia or absence of distal phalanges, sometimes whole digits
- Syndactyly, brachydactyly, polydactyly
- Lower limbs typically more affected than upper
- Often asymmetric
- Cardiovascular (especially NOTCH1):
- VSD, ASD
- Hypoplastic left heart syndrome
- Bicuspid aortic valve, aortic stenosis/coarctation
- Pulmonary stenosis, tetralogy of Fallot
- Cardiomyopathy in some
- Vascular:
- Cutis marmorata telangiectatica congenita (mottled net-like vascular pattern)
- Pulmonary hypertension (especially DOCK6)
- Portal hypertension, hepatoportal sclerosis
- Retinal vascular anomalies → vision loss
- CNS (especially DOCK6):
- Periventricular nodular heterotopia
- Polymicrogyria, porencephaly
- Periventricular calcifications
- Intellectual disability, seizures
- Clinical recognition: scalp ACC + terminal limb defects
- Molecular: Adams-Oliver gene panel or exome sequencing, which informs prognosis and recurrence risk
- Imaging at diagnosis: echocardiogram (mandatory, since cardiac involvement is common); brain MRI if AR form or neurologic findings; renal ultrasound
- Scalp defects: conservative (gentle wound care, antibiotics) for small defects; neurosurgical/plastic surgery for large or skull-deficient lesions to prevent hemorrhage and CNS infection
- Cardiac: echo at diagnosis; anatomy-driven cardiology follow-up
- Limb: orthopedics, prosthetics, occupational therapy
- Vascular surveillance: ophthalmologic exam (retinal vasculature), pulmonary HTN screening (especially in AR forms)
- Genetic counseling: AD vs AR distinction is essential for recurrence risk (50% vs 25%)
- Setleis syndrome / focal facial dermal dysplasia: facial bitemporal aplasia cutis without limb defects
- Amniotic band sequence: phenocopy with limb constriction/amputation; placenta/membranes show bands
- Trisomy 13: scalp ACC is a feature
- Goltz syndrome (focal dermal hypoplasia): PORCN, X-linked dominant; linear atrophic skin, limb defects