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frontonasal encephalocele neonate sincipital encephalocele nasal bridge swelling
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Neonatal Frontonasal (Sincipital) Encephalocele
Clinical Findings in This Neonate
The image shows a newborn with a large, smooth, dome-shaped, skin-covered midline mass at the glabella/frontonasal region (lower forehead-nasal bridge junction), accompanied by widening of the nasal bridge and hypertelorism (increased inter-orbital distance). These are the hallmark features of a sincipital (frontoethmoid) encephalocele - nasofrontal subtype.
DIAGNOSIS
Primary Diagnosis: Sincipital (Frontoethmoid) Encephalocele - Nasofrontal/Glabellar Type
A sincipital encephalocele is a herniation of CNS contents (meninges alone = meningocele; meninges + brain tissue = meningoencephalocele; meninges + brain + ventricle = meningoencephalocystocele) through a bony defect at the foramen cecum, between the frontal and ethmoid bones.
Classification of this case - Nasofrontal (Glabellar) subtype:
The mass is located at the glabella/nasal bridge, consistent with the nasofrontal variety of sincipital encephalocele. This type is:
- Most prevalent in Southeast Asia (Thailand, Vietnam, Cambodia, Myanmar) - incidence 1:3,500-5,000 live births (vs. 1:35,000 in Western countries)
- Results from failed closure of the anterior neuropore or poor migration of neural crest cells
- Communicates with the subarachnoid space through a skull base defect
- K.J. Lee's Essential Otolaryngology, p. 573
Differential Diagnoses to Exclude (Before Any Intervention):
| Condition | Key Features | Risk |
|---|---|---|
| Sincipital Encephalocele | Soft, compressible, pulsatile, Furstenberg sign positive | Intracranial connection in 100% |
| Nasal Glioma | Firm, non-compressible, not pulsatile | May have intranasal connection |
| Nasal Dermoid Cyst | Dome-shaped, midline, may have pit/hair | Intracranial connection in up to 25% |
| Deep Infantile Hemangioma | Soft, warm, grows in first weeks | No intracranial connection |
CRITICAL WARNING: Never biopsy, incise, or needle-aspirate this lesion before imaging. Encephaloceles have 100% intracranial connection - violation risks meningitis, CSF leak, and death. - Fitzpatrick's Dermatology, p. 1781
INVESTIGATIONS
Urgent (Bedside/Immediate):
- Furstenberg Test - Compress both internal jugular veins: positive if mass enlarges/pulsates (confirms intracranial communication). Also observed with Valsalva/crying.
- Transillumination - Helps assess if predominantly fluid-filled
- Vital signs + SpO2 - Assess for respiratory compromise (nasal obstruction in neonates who are obligate nose breathers)
- Full neurological examination - Tone, reflexes, fontanelle tension, head circumference
Imaging (Priority Order):
| Investigation | Purpose | Priority |
|---|---|---|
| MRI Brain + Face (with contrast) | Gold standard - defines herniated contents (brain tissue vs. meninges only), sac dimensions, neck of sac, intracranial anatomy (associated hydrocephalus, corpus callosum agenesis, Chiari) | FIRST CHOICE |
| CT Brain + Face (3D reconstruction) | Defines bony defect size and location, cranial base anatomy - essential for surgical planning | Required pre-op |
| Cranial Ultrasound | Bedside, no radiation, assesses for hydrocephalus, midline shift | Immediate adjunct |
| MR Angiography | If vascular structures may be within sac | Pre-op if needed |
Laboratory Investigations:
- CBC, CRP, blood culture - Baseline, rule out concurrent infection
- Serum electrolytes, glucose, calcium - Neonatal metabolic baseline
- Chromosomal microarray / Karyotype - Associated with trisomy 13, 18; Meckel-Gruber syndrome (autosomal recessive - encephalocele + polydactyly + polycystic kidneys)
- Coagulation profile (PT, APTT) - Pre-surgical
- Blood group and crossmatch - Pre-surgical
Specialist Consultations:
- Paediatric Neurosurgery (primary)
- Neonatology/NICU
- Paediatric Ophthalmology (visual pathway assessment, hypertelorism)
- Genetics
- Anaesthesia (paediatric)
TREATMENT PLAN
Immediate Stabilization (NICU):
- Protect the sac - Cover with warm, moist sterile gauze; do NOT compress
- Positioning - Lateral/prone to avoid direct pressure on mass
- Airway management - Assess for nasal obstruction; prepare for oral airway/intubation if needed (obligate nasal breathing in neonates)
- IV access + fluids - Maintain euglycemia and normal electrolytes
- Temperature regulation - Servo-controlled incubator
- Anti-seizure prophylaxis - Only if seizures observed; monitor with aEEG
- Prophylactic antibiotics - Consider if sac appears thin/leaking (risk of meningitis); e.g., IV cefotaxime
- Avoid LP until intracranial anatomy is defined
Definitive Treatment: Surgical Repair
Timing: Elective repair is typically performed at 3-6 months of age (once the infant is haemodynamically stable, has adequate body weight ~5 kg, and imaging is complete). Emergency surgery is indicated if the sac ruptures, skin breaks down, or there is rapid enlargement.
Surgical Approach:
| Lesion Type | Approach |
|---|---|
| External glabellar encephalocele (as in this case) | Open craniotomy + craniofacial repair - bifrontal approach |
| Intranasal encephalocele | Endoscopic transnasal repair |
| Small defects | Combined open + endoscopic |
Surgical Steps (Nasofrontal/Glabellar encephalocele):
- Bifrontal craniotomy
- Reduction of herniated brain/meningeal tissue (non-viable tissue resected; viable tissue returned to intracranial compartment)
- Closure of skull base defect in multilayer fashion (fat graft, fascia lata, pericranium, or alloplastic material)
- Craniofacial reconstruction of the glabella/nasal bridge
- Orbital osteotomies if significant hypertelorism is present (may be staged to 12-18 months)
- K.J. Lee's Essential Otolaryngology, p. 573; Bradley and Daroff's Neurology in Clinical Practice, p. 1875
Hydrocephalus management:
- If present pre- or post-operatively: ventriculoperitoneal (VP) shunt or endoscopic third ventriculostomy (ETV)
Post-operative Care:
- ICU monitoring post-craniotomy
- Serial head circumference measurements
- Ophthalmology follow-up for visual outcomes
- Neurodevelopmental surveillance (speech, motor, cognitive milestones)
- MRI at 3-6 months post-op to assess repair integrity
PROGNOSIS
| Factor | Impact |
|---|---|
| Nasofrontal location | Better prognosis than occipital (less brain tissue involved) |
| Meningocele only (no brain herniation) | Excellent neurological outcome |
| Meningoencephalocele | Higher risk of developmental delay, epilepsy |
| Hydrocephalus | Worsens outcome if uncontrolled |
| Associated anomalies (Meckel-Gruber, trisomy 13/18) | Poor prognosis |
In isolated nasofrontal encephaloceles without associated anomalies, the majority of children achieve good neurological and cosmetic outcomes following timely surgical repair.
Summary: This neonate has a sincipital nasofrontal encephalocele - a herniation of CNS tissue through a bony defect at the glabella. The priorities are: protect the sac, obtain urgent MRI + CT, consult paediatric neurosurgery, and plan elective craniofacial repair at 3-6 months after full stabilisation and imaging workup.
What are your thoughts about the condition cystic hygroma? Can this be the diagnosis?
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Can This Be Cystic Hygroma? - A Definitive Analysis
Short answer: No. Cystic hygroma is highly unlikely and should be ranked last in the differential for this neonate. Here is the complete reasoning.
What is Cystic Hygroma?
Cystic hygroma (now more precisely called macrocystic lymphatic malformation) is a multiloculated cystic mass lined by endothelial cells, arising from a developmental failure of the lymphatic jugular sacs to connect with the venous system. The retained lymph forms large cyst-like spaces. It is present at birth in approximately 50% of cases.
- Sabiston Textbook of Surgery, p. 2674
Comparison: Cystic Hygroma vs. This Case
Here is a textbook from Bailey and Love for visual comparison - notice the classic neck/submandibular location and the diffuse, soft, non-discrete swelling:
Figure 52.65 - Cystic hygroma. Bailey & Love's Short Practice of Surgery, 28th Ed., p. 827
Point-by-Point Comparison
| Feature | Cystic Hygroma | This Neonate's Mass | Verdict |
|---|---|---|---|
| Location | Posterior neck (most common), also axilla, groin, mediastinum, floor of mouth | Midline glabella / frontonasal | ❌ Wrong site for hygroma |
| Shape | Diffuse, lobulated, poorly marginated - conforms to tissue planes | Well-defined, dome-shaped, discrete | ❌ Wrong morphology |
| Skin color | Normal overlying skin, may appear bluish if large | Normal skin, no bluish tinge | ✓ Compatible - but non-specific |
| Transillumination | Brilliantly transilluminant (filled with clear lymph - this is the hallmark sign) | Encephaloceles are NOT brilliantly transilluminant | ❌ Test would differentiate |
| Compressibility | Soft and partially compressible; increases with cough/cry | Encephaloceles are soft AND increase with crying (via Furstenberg mechanism - but via CSF, not lymph) | ⚠️ Overlapping but different mechanism |
| Anatomical embryology | Derived from lymphatic sac failure (mesoderm/endothelium) | Derived from failed neural tube closure (neuroectoderm) | ❌ Entirely different origin |
| Furstenberg test | Negative - does not expand with jugular compression | Positive in encephalocele | ❌ Test would definitively separate |
| Pulsatility | Non-pulsatile | Can be pulsatile (transmitted from CSF) | ❌ Favors encephalocele |
| Bony defect on imaging | No skull defect | Skull base defect present | ❌ Definitive on CT/MRI |
| Midline facial anomaly | Does NOT cause hypertelorism or nasal bridge widening | Causes hypertelorism by expanding through the foramen cecum | ❌ Structural explanation only fits encephalocele |
| Intracranial connection | None | 100% in encephalocele | ❌ Critical safety difference |
Why Location Alone Excludes Cystic Hygroma Here
The authoritative textbook description is unambiguous:
"Swelling usually occurs in the neck and may involve the face, submandibular region, tongue and floor of the mouth... The cheek, axilla, groin and mediastinum are other less frequent sites."
- Bailey & Love's Short Practice of Surgery, 28th Ed., p. 827
The glabella/frontonasal midline is not a recognised site for cystic hygroma. There are no lymphatic jugular sac remnants at this anatomical location. The lymphatic system does not drain this region in a pattern that would produce a cystic hygroma here.
The One Shared Feature That Could Cause Confusion
Both lesions in neonates are:
- Soft
- Present at birth
- Skin-covered
- May increase in size with crying
However, the mechanism differs completely: hygroma enlarges with crying due to increased venous/lymphatic pressure, while an encephalocele enlarges due to increased intracranial pressure transmitted through the CSF connection.
Bedside Test to Definitively Separate Them
| Test | Cystic Hygroma | Encephalocele |
|---|---|---|
| Transillumination | Brilliant (clear lymph fluid) | Dull or partially transilluminant (brain/meningeal tissue) |
| Furstenberg test (bilateral jugular compression) | Negative - no enlargement | Positive - mass enlarges |
| Pulsation | Absent | Present (CSF transmitted) |
Conclusion
Cystic hygroma should not be listed as a serious differential diagnosis for this neonate. The midline glabellar location, secondary hypertelorism, nasal bridge widening, and discrete dome shape are pathognomonic of a sincipital frontonasal encephalocele. Cystic hygroma belongs to the differential only for posterior neck or axillary masses in newborns.
The danger in even entertaining a hygroma diagnosis here is that it might tempt a clinician to proceed with aspiration or incision - which would be catastrophic given the 100% intracranial connection of encephaloceles. MRI remains mandatory before any intervention regardless of the working diagnosis.
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