Craniosynostosis

Disease Description (Causes and Symptoms)

• Definition: Craniosynostosis is a condition in which the cranial sutures (the seams between the bones that make up the skull) fuse earlier than normal, affecting the normal growth and development of the skull and brain.
• Causes and pathophysiology:
  • Nonsyndromic (fusion of a single suture): The cause is unclear in most cases.
  • Syndromic (multiple suture fusion + other abnormalities): It may result from genetic mutations (e.g., in the FGFR family) or may be inherited within a family.
  • Premature fusion causes changes in skull shape according to the direction of the fused suture and, in severe cases, restriction of brain growth due to increased intracranial pressure.
• Main symptoms:
  • Abnormal head shape (various patterns depending on the location of the fused suture, including trigonocephaly, scaphocephaly, plagiocephaly, brachycephaly, and oxycephaly)
  • A hard ridge over the suture
  • Proptosis (due to abnormal orbital development), vision problems
  • Hearing impairment, language, feeding, and developmental delays (in severe cases)
  • Associated abnormalities (cleft lip and palate, syndactyly of the hands or feet, heart abnormalities, etc.) — particularly common in syndromic cases
• Differential diagnosis: Positional head-shape deformities (flat head or positional plagiocephaly) can be distinguished because the sutures remain open and feel soft on palpation, among other features.

Treatment (Standard Treatment, Procedures/Surgery, Lifestyle Management and Precautions)

• Basics of diagnosis: 3D CT (to assess skull shape and sutures), ophthalmologic examination, hearing and developmental assessments, and, when necessary, genetic testing and a multidisciplinary approach (including plastic surgery, pediatric neurosurgery, pediatric genetics, ophthalmology, etc.)
• Conservative treatment:
  • A helmet (corrective helmet) may be used in very mild or atypical cases, or as an adjunct before a procedure is performed (particularly after endoscopic resection).
  • Regular developmental monitoring and supportive therapies such as physical and speech therapy when necessary.
• Surgical treatment (standard approaches):
  • Endoscopic strip craniectomy: When performed before 3–6 months of age and combined with helmet therapy, it can produce good results. The surgery is shorter and recovery is faster.
  • Traditional cranial vault remodeling (fronto-orbital advancement): Often performed around 6–12 months of age when the deformity is severe or the patient is not a candidate for endoscopic surgery.
  • Distraction osteogenesis: A method of gradually expanding the bone using a device after osteotomy (used for certain deformities).
  • In emergencies or when increased intracranial pressure is present: Early skull expansion surgery is necessary (it may be performed within the first 3 months of life).
• Surgical considerations and risks:
  • Bleeding, infection, complications related to anesthesia, recurrence of the skull deformity, or the need for additional correction
  • Syndromic or multiple suture fusion may require staged surgeries.
  • Vision, hearing, and brain development problems may not all improve with surgery, so early evaluation and follow-up are important.
• Self-care and lifestyle management:
  • Follow the surgical team's instructions regarding restrictions and precautions before and after surgery (fasting, discontinuing medications, etc.).
  • Perform postoperative wound care, attend regular outpatient follow-up visits, and complete developmental, vision, and hearing assessments.
  • Protect the head (avoid impacts) and report suspected infections to the medical team immediately.

Checklist Before an Outpatient Visit (Items to Prepare · Pre-visit Checks — Including Example Questions)

• Recommended items to bring:
  • A list of currently used medications (including medications being prescribed on an extended basis)
  • Birth records and previous medical records (especially neonatal problems and birth history), plus copies of any CT images, photographs, or test results already obtained
  • Photos of the child's head (front, side, and back) — for observing changes
  • Head circumference records (e.g., values recorded in the vaccination booklet) and developmental milestones (feeding, sleep, language, and motor development)
• Pre-visit checks:
  • The timing and progression of symptoms (when changes in head shape were first observed and the rate of growth)
  • Check for headaches, vomiting, sleep disturbances, or excessive irritability (possible signs of increased intracranial pressure)
• Materials that are useful to provide to the doctor during the visit:
  • Photographs (over time), clinical test results, and family history (whether similar abnormalities or genetic diseases are present)
• Example questions (questions the patient can check in advance):
  • "How is our child's head shape different from that of other children?"
  • "What additional tests are needed, and when should they be performed?"

Examples of General Questions to Ask the Doctor

• "Does this child need surgery? If so, when would be the appropriate time?"
• "What type of surgery is expected, and what are its advantages and disadvantages (including complications)?"
• "What will the recovery process be like after surgery, and will rehabilitation (such as helmet therapy, physical therapy, or speech therapy) be necessary?"
• "What is the likely long-term prognosis (skull shape, neurodevelopment, vision, and hearing)?"
• "Is genetic testing necessary? Are there any considerations for family planning?"

Examples of Condition-Specific Questions

• If a syndromic condition is suspected:
  • "Do you recommend genetic testing? Which genes are likely to be major causes?"
  • "If a syndromic condition is confirmed, which additional specialists (such as cardiology or orthopedics) should be involved in follow-up?"
• If there is concern about increased intracranial pressure (symptoms are present):
  • "If symptoms such as vomiting, sleep disturbances, or excessive crying occur, should we come to the hospital as an emergency? What signs should we watch for?"

(Note: The diagnostic and treatment plan varies depending on the individual patient's condition, the location of the suture, the extent of fusion, age, and whether a syndromic condition is present. Please consult the treating medical team for an accurate diagnosis and treatment plan.)