J Korean Neurosurg Soc.  2016 May;59(3):204-213. 10.3340/jkns.2016.59.3.204.

Physiological Changes and Clinical Implications of Syndromic Craniosynostosis

Affiliations
  • 1Department of Pediatric Neurosurgery, Osaka City General Hospital, Osaka, Japan. h-sakamot@msic.med.osaka-cu.ac.jp
  • 2Department of Neurosurgery, Osaka City University Graduate School of Medicine, Osaka, Japan.
  • 3Department of Plastic and Reconstructive Surgery, Osaka City General Hospital, Osaka, Japan.

Abstract

Syndromic craniosynostosis has severe cranial stenosis and deformity, combined with hypoplastic maxillary bone and other developmental skeletal lesions. Among these various lesions, upper air way obstruction by hypoplastic maxillary bone could be the first life-threatening condition after birth. Aggressive cranial vault expansion for severely deformed cranial vaults due to multiple synostoses is necessary even in infancy, to normalize the intracranial pressure. Fronto-orbital advancement (FOA) is recommended for patients with hypoplastic anterior part of cranium induced by bicoronal and/or metopic synostoses, and posterior cranial vault expansion is recommended for those with flattening of the posterior part of the cranium by lambdoid synostosis. Although sufficient spontaneous reshaping of the cranium can be expected by expansive cranioplasty, keeping the cranial bone flap expanded sufficiently is often difficult when the initial expansion is performed during infancy. So far distraction osteogenesis (DO) is the only method to make it possible and to provide low rates of re-expansion of the cranial vault. DO is quite beneficial for both FOA and posterior cranial vault expansion, compared with the conventional methods. Associated hydrocephalus and chronic tonsillar herniation due to lambdoid synostosis can be surgically treatable. Abnormal venous drainages from the intracranial space and air way obstruction should be always considered at any surgical procedures. Neurosurgeons have to know well about the managements not only of the deformed cranial vault and the associated brain lesions but also of other multiple skeletal lesions associated with syndromic craniosynostosis, to improve treatment outcome.

Keyword

Syndromic craniosynsotosis; Cranial vault; Cranioplasty; Intracranial pressure; Fronto-orbital advancement; Distraction osteogenesis

MeSH Terms

Brain
Congenital Abnormalities
Constriction, Pathologic
Craniosynostoses*
Encephalocele
Humans
Hydrocephalus
Intracranial Pressure
Maxilla
Osteogenesis, Distraction
Parturition
Skull
Synostosis
Treatment Outcome

Figure

  • Fig. 1 Plain radiographs of a child with Apert syndrome who underwent fronto-orbital advancement (FOA) by distraction osteogenesis (DO). A and B : Before surgery (4 months old). C : At the time of completion of distraction (5 months old). D : 3 years after FOA (3 years and 8 months old). Newly developed bone was found at the bone defects. E and F : 8 years after FOA (8 years old). The advanced frontal bone with the supraorbital bar is well maintained without retraction. Maxillary bone advancement was performed later.

  • Fig. 2 Plain radiographs of a child with Crouzon syndrome who underwent FOA by DO. A and B : Before surgery (5 months old). C : At the time of completion of distraction (8 months old). The bone defect was filled by newly developed bone. D : 1 years after FOA (2 years old). E and F : 6 years after FOA (6 years old). The advanced frontal bone with the supraorbital bar is well maintained without retraction. Maxillary bone advancement was performed later. FOA : fronto-orbital advancement, DO : distraction osteogenesis.

  • Fig. 3 Plain radiographs of a child with Apert syndrome who underwent re-expansion after FOA by DO. A : Before surgery (3 months old). B : At the time of completion of distraction (7 months old). C : 1 years after FOA (1 year 9 months old). D : At the time of diagnosis for chocked disc (2 years old). The advanced fontal bone was slightly retracted (arrow). E : 6 months after re-expansion with FOA by conventional method. Chocked disc disappeared (3 years old). FOA : fronto-orbital advancement, DO : distraction osteogenesis.


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