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Wolf-Hirschhorn syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Wolf-Hirschhorn syndrome

Wolf-Hirschhorn syndrome is a genetic condition affecting multiple body systems, characterized by distinctive facial features, delayed growth, intellectual disability, and seizures.

Overview

Wolf-Hirschhorn syndrome is a complex disorder. A hallmark of the condition is a specific facial appearance often described as a "Greek warrior helmet," featuring a broad nasal bridge, large protruding eyes, and a high forehead.

Symptoms

  • Growth and development: Slow growth before and after birth, failure to thrive, weak muscle tone (hypotonia), and significant delays in motor skills.
  • Intellectual disability: Ranges from mild to severe; while socialization skills are often strong, verbal and language skills are typically weaker.
  • Seizures: Most affected children experience seizures, which may be treatment-resistant but often diminish with age.
  • Physical features: Small head size (microcephaly), downturned mouth, small chin (micrognathia), and poorly formed ears.
  • Other abnormalities: Skin changes, skeletal issues (such as spinal curvature), dental problems, and potential cleft lip or palate.

Causes & Risk Factors

The syndrome is caused by a deletion of genetic material near the end of the short (p) arm of chromosome 4 (4p-). The severity of the condition often correlates with the size of the deletion. Specific genes lost in this region include NSD2 (linked to facial features and development), LETM1 (linked to seizures), and MSX1 (linked to dental and palate abnormalities).

Inheritance

Approximately 85 to 90 percent of cases are not inherited; they occur as random (de novo) events. In a small percentage of cases, the syndrome is caused by a ring chromosome. In the remaining cases, an individual inherits a deleted segment of chromosome 4 from a parent who carries a balanced translocation.

Frequently Asked Questions

Key red flags include prenatal or postnatal growth restriction, microcephaly, a “Greek warrior helmet” facial appearance (high forehead, broad nasal bridge, prominent eyes), hypotonia, and early‑onset seizures. When two or more of these signs are present, a chromosomal microarray or FISH test for 4p deletion is recommended.
Many infants have poor suck and reflux; early involvement of a speech‑language pathologist and occupational therapist for oral‑motor therapy is essential. If oral intake remains insufficient, a nasogastric tube or gastrostomy may be placed to ensure adequate calories. Growth hormone therapy can be considered after 2 years of age if growth velocity remains below the 3rd percentile and endocrine evaluation is normal.
First‑line therapy usually starts with a broad‑spectrum antiseizure medication such as levetiracetam or valproic acid. Because seizures can be refractory, a referral is advised if seizures persist after two adequate medication trials, if there are multiple seizure types, or if EEG shows evolving patterns. A specialized center can consider ketogenic diet, vagus nerve stimulation, or epilepsy surgery.
When a parent carries a balanced translocation that includes the WHS critical region, the risk of having another child with Wolf‑Hirschhorn syndrome is approximately 10‑15 %, though exact risk varies with the specific translocation breakpoints. Genetic counseling and prenatal diagnostic options (chorionic villus sampling or amniocentesis with microarray) should be discussed before subsequent pregnancies.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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