Hyper IgE Syndrome (HIES) in Pediatrics

Types

Clinical Features in Children

🔴 Immunologic / Infectious

• Recurrent skin infections
  • Neonatal rash (often the first sign — eczematous, seen in newborns)
  • "Cold" (non-inflamed) Staphylococcal skin abscesses — characteristic because they lack the expected warmth/redness due to impaired neutrophil chemotaxis
• Recurrent sinopulmonary infections
  • Recurrent S. aureus and H. influenzae pneumonias
  • Pneumatoceles (post-pneumonia cystic lung lesions) — hallmark finding
  • Fungal infections (Aspergillus, Candida)
• Mucocutaneous candidiasis
• Eosinophilia

🟡 Non-Immunologic (AD-HIES / STAT3 — especially prominent in children)

• Failure to shed primary (deciduous) teeth — pathognomonic; children may retain primary teeth while permanent teeth erupt, leading to double rows of teeth

• Coarse facial features
• Prominent forehead, deep-set eyes
• Broad nasal bridge, fleshy nose tip
• Facial asymmetry

• Hyperextensibility of joints
• Scoliosis
• Osteoporosis / osteopenia → recurrent fractures (often with minimal trauma)
• Craniosynostosis (rare)

• High arched palate
• Midline abnormalities (Chiari malformation reported)

🟢 AR-HIES (DOCK8) — Additional Features

• Severe, recurrent viral infections (HSV, molluscum, HPV)
• Food allergies and atopy more pronounced
• Malignancy risk increased (lymphoma, squamous cell carcinoma)
• CNS vasculopathy (stroke risk)
• Absence of the skeletal/dental manifestations of STAT3

Key Laboratory Findings

Diagnosis

• Elevated IgE
• Recurrent pneumonias
• Pneumatoceles
• Eczema
• Skin abscesses
• Retained primary teeth
• Characteristic face
• Scoliosis / fractures
• Elevated eosinophils

Management Highlights

• Prophylactic antibiotics: TMP-SMX for Pneumocystis and Staphylococcus
• Antifungal prophylaxis: Fluconazole or itraconazole
• Aggressive treatment of active infections
• IVIG in some patients with poor antibody responses
• Hematopoietic stem cell transplantation (HSCT): curative option, especially considered in AR-HIES (DOCK8)
• Dermatologic care for eczema (topical steroids, tacrolimus)
• Dental / orthopedic surveillance

Mnemonic: "FATED"

Facial dysmorphy | Abscesses (cold) | Teeth (retained primary) | Eczema | Double-elevated IgE

Repeated Respiratory Distress in a 2-Year-Old Male — Differential Diagnosis

🔴 Most Common / Must-Not-Miss First

1. Recurrent Viral-Induced Wheeze / Early Childhood Asthma

• Most common cause at this age
• Triggered by URTIs (RSV, rhinovirus), cold air, allergens
• Expiratory wheeze, prolonged expiration, increased work of breathing
• Key feature: episodic, responds to bronchodilators
• Distinguishing: >3 episodes of wheeze → consider asthma workup (API score)

2. Foreign Body Aspiration

• Peak incidence: 6 months – 3 years
• Classic: sudden onset choking episode → may be followed by recurrent wheeze/pneumonia
• Often unilateral wheeze or decreased breath sounds
• Radiolucent (peanuts, seeds) — chest X-ray may show air trapping, mediastinal shift
• Must not miss — easily overlooked if initial episode was unwitnessed

3. Gastroesophageal Reflux Disease (GERD) with Aspiration

• Silent microaspiration causes recurrent cough, wheeze, or pneumonia
• Often worse when supine/after feeds
• Associated: arching, vomiting, feeding difficulties
• Can trigger laryngospasm → sudden respiratory distress

🟡 Structural / Anatomical Causes

4. Vascular Ring / Sling

• Double aortic arch, pulmonary artery sling
• Compresses trachea/esophagus
• Biphasic stridor, recurrent wheeze, dysphagia
• Symptoms present from infancy; exacerbated by URTIs
• Barium swallow, CT angiography, bronchoscopy

5. Tracheobronchomalacia

• Floppy airway → dynamic collapse during expiration (or inspiration)
• Recurrent wheeze/stridor, "brassy" cough
• May be primary or secondary (post-intubation, associated with tracheoesophageal fistula)
• Diagnosed on flexible bronchoscopy (>50% collapse)

6. Congenital Lobar Emphysema / Bronchogenic Cyst

• Presents with recurrent respiratory distress, localized hyperlucency on CXR
• May be asymptomatic at birth, worsen in toddler years

7. Laryngomalacia (usually presents in infancy but can persist)

• Inspiratory stridor, worse with feeding/agitation
• Usually improves by 18–24 months; if persisting → consider other structural causes

🟠 Infectious / Inflammatory

8. Recurrent Pneumonia

• Recurrent pneumonias in same lobe → structural cause (sequestration, bronchial stenosis, foreign body)
• Recurrent pneumonias in different lobes → systemic cause (immunodeficiency, CF, aspiration)

9. Recurrent Croup (Spasmodic Croup)

• Sudden-onset barking cough, inspiratory stridor, typically nocturnal
• Recurrence (>2 episodes) raises concern for subglottic stenosis, GERD

10. Pertussis / Atypical Pathogens (Mycoplasma)

• Paroxysmal cough, post-tussive vomiting
• Can cause prolonged wheeze and respiratory distress

🟢 Systemic / Genetic Causes (especially with recurrent infections)

11. Cystic Fibrosis

• Chronic productive cough, wheeze, recurrent lower respiratory infections
• Failure to thrive, steatorrhea
• Sweat chloride test >60 mEq/L diagnostic
• Consider if recurrent Pseudomonas or S. aureus pulmonary infections

12. Primary Immunodeficiency

• Recurrent severe/unusual respiratory infections
• Examples: XLA, CVID, SCID, Hyper-IgM, Hyper-IgE syndrome
• Workup: serum immunoglobulins, lymphocyte subsets, vaccine antibody titers

13. Primary Ciliary Dyskinesia (PCD)

• Chronic wet cough, recurrent otitis media, sinusitis
• Situs inversus in ~50% (Kartagener syndrome)
• Nasal NO, ciliary biopsy for diagnosis

14. Tracheoesophageal Fistula (H-type)

• Late-presenting; recurrent aspiration pneumonia, choking with feeds
• Barium swallow may miss → bronchoscopy/esophagoscopy needed

🔵 Cardiac Causes

15. Congenital Heart Disease with Pulmonary Overcirculation

• Large VSD, AV canal, PDA → left heart failure → pulmonary edema
• Tachypnea, poor weight gain, hepatomegaly, recurrent "chest infections"
• Echocardiography diagnostic

16. Pulmonary Hypertension

• Tachypnea, exertional distress, cyanosis

Diagnostic Approach Summary

Red Flags Warranting Urgent Evaluation

• Unilateral wheeze or absent breath sounds → foreign body / structural
• Failure to thrive + recurrent infections → CF / immunodeficiency
• Stridor at rest, worsening → fixed airway obstruction
• Symptoms since neonatal period → congenital anomaly
• No response to bronchodilators → not simple asthma
• Cyanosis / hepatomegaly → cardiac cause