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Baller-Gerold syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Baller-Gerold syndrome

Baller-Gerold syndrome is a rare condition characterized by the premature fusion of certain skull bones (craniosynostosis) and distinctive abnormalities of bones in the arms and hands.

Overview

Baller-Gerold syndrome is a rare condition characterized by the premature fusion of certain skull bones (craniosynostosis) and abnormalities of bones in the arms and hands.

People with Baller-Gerold syndrome have prematurely fused skull bones, most often along the coronal suture, the growth line that goes over the head from ear to ear. Other sutures of the skull may be fused as well. These changes result in an abnormally shaped head, a brachycephaly, and bulging eyes with shallow eye sockets (exophthalmos). Other distinctive facial features can include widely spaced eyes (hypertelorism), a micrognathia, and a saddle-shaped or underdeveloped nose.

Bone abnormalities in the hands include missing fingers (oligodactyly) and malformed or absent thumbs. Partial or complete absence of bones in the forearm is also common. Together, these hand and arm abnormalities are called radial ray defects.

People with Baller-Gerold syndrome may have a variety of additional signs and symptoms including slow growth beginning in infancy, small stature, and malformed or missing kneecaps (patellae). A skin rash often appears on the arms and legs a few months after birth. This rash spreads over time, causing patchy changes in skin coloring, areas of thinning skin (atrophy), and small clusters of blood vessels just under the skin (telangiectases). These chronic skin problems are collectively known as poikiloderma.

The varied signs and symptoms of Baller-Gerold syndrome overlap with features of other disorders, namely Rothmund-Thomson syndrome and RAPADILINO syndrome. These syndromes are also characterized by radial ray defects, skeletal abnormalities, and slow growth. All of these conditions can be caused by mutations in the same gene. Based on these similarities, researchers are investigating whether Baller-Gerold syndrome, Rothmund-Thomson syndrome, and RAPADILINO syndrome are separate disorders or part of a single syndrome with overlapping signs and symptoms.

Frequency

The prevalence of Baller-Gerold syndrome is unknown, but this rare condition probably affects fewer than 1 per million people. Fewer than 40 cases have been reported in the medical literature.

Causes & Risk Factors

Mutations in the RECQL4 gene cause some cases of Baller-Gerold syndrome. This gene provides instructions for making one member of a protein family called RecQ helicases. Helicases are enzymes that bind to DNA and temporarily unwind the two spiral strands (double helix) of the DNA molecule. This unwinding is necessary for DNA replication in preparation for cell division, and for repairing damaged DNA. The RECQL4 protein helps stabilize genetic information in the body's cells and plays a role in replicating and repairing DNA.

Mutations in the RECQL4 gene prevent cells from producing any RECQL4 protein or change the way the protein is pieced together, which disrupts its usual function. A shortage of this protein may prevent normal DNA replication and repair, causing widespread damage to a person's genetic information over time. It is unclear how a loss of this protein's activity leads to the signs and symptoms of Baller-Gerold syndrome.

This condition has been associated with prenatal (before birth) exposure to a drug called sodium valproate. This medication is used to treat epilepsy and certain psychiatric disorders. Some infants whose mothers took sodium valproate during pregnancy were born with the characteristic features of Baller-Gerold syndrome, such as an unusual skull shape, distinctive facial features, and abnormalities of the arms and hands. However, it is unclear if exposure to the medication caused the condition.

Associated Gene

  • RECQL4

Inheritance

This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

Other Names

  • BGS
  • Craniosynostosis with radial defects
  • Craniosynostosis-radial aplasia syndrome

Frequently Asked Questions

premature fusion of the coronal skull suture (craniosynostosis) often shows up as a flattened forehead and a bulging, shallow eye socket. Limb findings include missing or malformed fingers, absent thumbs, or a shortened forearm. A characteristic skin rash—poikiloderma—appears within the first months as patchy discoloration and thinning skin on the arms and legs. How is Baller‑Gerold syndrome confirmed and what genetic test is used?::A clinical evaluation is followed by molecular testing for mutations in the RECQL4 gene, which is responsible for the syndrome. Whole‑exome sequencing or targeted gene panels can detect pathogenic variants. Prenatal testing is available if a family mutation has been identified. What surgical or medical interventions are typically required for skull and limb abnormalities?::Early cranial vault remodeling (usually before 12 months) corrects skull shape and prevents intracranial pressure issues. Limb reconstruction may involve osteotomies, tendon transfers, or prosthetic fitting to improve function. Hand surgery can address radial ray defects, while orthopedic care manages patellar anomalies and growth delays. What long‑term health or developmental issues should families monitor in children with Baller‑Gerold syndrome?::Growth retardation, short stature, and delayed motor milestones are common; regular growth charting and physical therapy help. Vision problems due to shallow orbits require ophthalmologic evaluation. Cardiac anomalies, such as atrial septal defects, can occur, so echocardiograms are recommended. Skin care for poikiloderma includes sun protection, moisturizers, and dermatology follow‑up to monitor for skin cancers.
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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