🧴 TOACS FCPS Station · Collodion Baby (Gelatinous Skin)
Nelson · 22nd Ed · “Newborn with a shiny, taut, parchment-like membrane (collodion membrane) covering the entire body; most evolve into lamellar ichthyosis or CIE; managed with emollients, humidification, and monitoring for dehydration/infection”
⏱️ 7 minutes · Examiner-led · Observed station
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📷 Clinical Photograph – Collodion Baby
Figure 1 · Collodion Baby · Ichthyosis (LI or CIE)
🔍 Key clinical features:
- ✓ Shiny, taut, parchment-like membrane – covers the entire body
- ✓ Gelatinous or collodion appearance – thick, translucent, yellowed
- ✓ Ectropion – eversion of eyelids
- ✓ Eclabion – eversion of lips
- ✓ Flexion contractures – of fingers and toes
📋 Clinical scenario (examiner prompt)
A 1‑day‑old newborn is transferred to the NICU because of a stiff, shiny, gelatinous covering over the entire body. The infant has difficulty opening the eyes (ectropion) and a fixed, open mouth (eclabion). The skin is taut and cracked, especially over the joints. The baby was born at term via normal vaginal delivery. There is no family history of skin disease.
Shiny, taut gelatinous membrane
Ectropion and eclabion
Cracked skin over joints
Term newborn
🧑⚕️ Examiner tasks · TOACS
1. Identify the diagnosis from the clinical image and context.
2. Describe the clinical features (collodion membrane, ectropion, eclabion, contractures).
3. Explain the underlying condition and its evolution (collodion baby, most evolve into lamellar ichthyosis or CIE).
4. Discuss management (NICU, humidification, emollients, monitoring, genetic testing).
⚠️ Key concept: A collodion baby is a newborn with a shiny, taut, parchment-like membrane covering the entire body. It is a clinical phenotype rather than a specific diagnosis, and most infants evolve into lamellar ichthyosis (LI) or congenital ichthyosiform erythroderma (CIE). Management includes NICU admission, humidified environment, gentle emollients, and monitoring for dehydration, hypernatremia, and infection. A self-healing variant exists (self-healing collodion baby). Genetic testing is recommended to identify the underlying ichthyosis.
🎯 Expected answers (for examiners)
- • Diagnosis: Collodion baby – a newborn phenotype of ichthyosis
- • Clinical features: Shiny, taut, parchment-like (collodion) membrane covering entire body; ectropion (eversion of eyelids); eclabion (eversion of lips); flexion contractures of digits; cracked skin over joints; may have ear deformities, nasal flattening
- • Etiology: Most commonly due to autosomal recessive congenital ichthyoses (ARCI) – mutations in TGM1, ABCA12, ALOX12B, ALOXE3, CYP4F22, etc. Self-healing variant exists (loss-of-function mutations in TGM1 or others).
- • Evolution: The membrane sheds within days to weeks. Most infants evolve into lamellar ichthyosis (large dark scales) or congenital ichthyosiform erythroderma (fine white scaling on erythrodermic skin).
- • Management: NICU admission; humidified incubator; avoid dehydration (increased insensible water loss); gentle emollients (petrolatum, Aquaphor); avoid aggressive debridement; monitor for infection; ophthalmology for ectropion; genetic testing; family counseling
📌 Collodion baby – key points:
• Definition: Newborn with collodion membrane – shiny, taut, parchment-like
• Evolution: Most → LI or CIE; self-healing variant exists
• Genes: TGM1 (most common), ABCA12, ALOX12B, etc.
• Management: NICU, humidification, emollients, monitor dehydration
• Prognosis: Depends on underlying ichthyosis; with modern care, good
• Definition: Newborn with collodion membrane – shiny, taut, parchment-like
• Evolution: Most → LI or CIE; self-healing variant exists
• Genes: TGM1 (most common), ABCA12, ALOX12B, etc.
• Management: NICU, humidification, emollients, monitor dehydration
• Prognosis: Depends on underlying ichthyosis; with modern care, good
⚡ Quick FCPS‑style MCQ
A newborn with a shiny, taut, parchment-like membrane, ectropion, and eclabion. The most appropriate initial management includes:
A. Aggressive debridement of the membrane B. NICU admission, humidification, and gentle emollients C. Immediate oral retinoids D. Topical salicylic acid📌 Topic summary · Collodion Baby
Definition
Collodion membrane phenotype
Collodion membrane phenotype
Features
Shiny, taut, ectropion, eclabion
Shiny, taut, ectropion, eclabion
Evolution
→ LI or CIE (most)
→ LI or CIE (most)
Genes
TGM1, ABCA12, ALOX12B
TGM1, ABCA12, ALOX12B
Management
NICU, humidification, emollients
NICU, humidification, emollients
Prognosis
Depends on underlying type
Depends on underlying type
| Feature | Collodion Baby |
|---|---|
| Definition | Newborn covered by a shiny, taut, parchment-like membrane (collodion membrane) |
| Associated findings | Ectropion (eversion of eyelids), eclabion (eversion of lips), flexion contractures, cracked skin, ear/nasal deformities |
| Underlying ichthyoses | Most commonly lamellar ichthyosis (LI) or congenital ichthyosiform erythroderma (CIE); self-healing collodion baby variant exists |
| Genes | Autosomal recessive: TGM1 (most common), ABCA12, ALOX12B, ALOXE3, CYP4F22, NIPAL4; self-healing variant may have loss-of-function TGM1 |
| Initial management | NICU admission; humidified incubator; gentle emollients (petrolatum, Aquaphor); avoid aggressive debridement; monitor for dehydration, hypernatremia, infection |
| Long-term management | Depends on evolving ichthyosis: emollients, keratolytics, oral retinoids for severe cases |
| Prognosis | Depends on underlying disorder; with modern supportive care, survival is excellent, and many children do well |
Source: Nelson Textbook of Pediatrics 22nd Ed : Disorders of Keratinization · TOACS FCPS station.