| Crouzon syndrome |
|
Patient with Crouzon syndrome (1912)
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| Classification and external resources |
| Specialty |
medical genetics |
| ICD-10 |
Q75.1 |
| ICD-9-CM |
756.0 |
| OMIM |
123500 |
| DiseasesDB |
3203 |
| eMedicine |
ped/511 derm/734 |
| MeSH |
D003394 |
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[edit on Wikidata]
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Crouzon syndrome is an autosomal dominant genetic disorder known as a branchial arch syndrome. Specifically, this syndrome affects the first branchial (or pharyngeal) arch, which is the precursor of the maxilla and mandible. Since the branchial arches are important developmental features in a growing embryo, disturbances in their development create lasting and widespread effects.
This syndrome is named after Octave Crouzon,[1][2] a French physician who first described this disorder. He noted the affected patients were a mother and her daughter, implying a genetic basis. First called "craniofacial dysostosis", the disorder was characterized by a number of clinical features. This syndrome is caused by a mutation in the fibroblast growth factor receptor II, located on chromosome 10.
Breaking down the name, "craniofacial" refers to the skull and face, and "dysostosis" refers to malformation of bone.
Now known as Crouzon syndrome, the disease can be described by the rudimentary meanings of its former name. What occurs in the disease is that an infant's skull and facial bones, while in development, fuse early or are unable to expand. Thus, normal bone growth cannot occur. Fusion of different sutures leads to different patterns of growth of the skull.
Examples include: trigonocephaly (fusion of the metopic suture), brachycephaly (fusion of the coronal suture), dolichocephaly (fusion of the sagittal suture), plagiocephaly (unilateral premature closure of lambdoid and coronal sutures), oxycephaly (fusion of coronal and lambdoidal sutures), Kleeblattschaedel (premature closure of all sutures).
Contents
- 1 Signs and symptoms
- 2 Causes
- 3 Diagnosis
- 4 Treatment
- 5 Epidemiology
- 6 Dental significance
- 7 See also
- 8 References
- 9 External links
Signs and symptoms
As a result of the changes to the developing embryo, the symptoms are very pronounced features, especially in the face. Low-set ears are a typical characteristic, as in all of the disorders which are called branchial arch syndromes. The reason for this abnormality is that ears on a foetus are much lower than those on an adult. During normal development, the ears "travel" upward on the head; however, in Crouzon patients, this pattern of development is disrupted. Ear canal malformations are extremely common, generally resulting in some hearing loss. In particularly severe cases, Ménière's disease may occur.
The most notable characteristic of Crouzon syndrome is craniosynostosis, as described above; however it usually presents as brachycephaly resulting in the appearance of a short and broad head. Exophthalmos (bulging eyes due to shallow eye sockets after early fusion of surrounding bones), hypertelorism (greater than normal distance between the eyes), and psittichorhina (beak-like nose) are also symptoms. Additionally, external strabismus is a common occurrence, which can be thought of as opposite from the eye position found in Down syndrome. Lastly, hypoplastic maxilla (insufficient growth of the midface) results in relative mandibular prognathism (chin appears to protrude despite normal growth of mandible) and gives the effect of the patient having a concave face. Crouzon syndrome is also associated with patent ductus arteriosus (PDA) and aortic coarctation.
For reasons that are not entirely clear, most Crouzon patients also have noticeably shorter humerus and femur bones relative to the rest of their bodies than members of the general population. A small percentage of Crouzon patients also have what is called "Type II" Crouzon syndrome, distinguished by partial syndactyly.
Causes
Associations with mutations in the genes of FGFR2[3] and FGFR3[4] have been identified.[5][6]
Diagnosis
Diagnosis of Crouzon syndrome usually can occur at birth by assessing the signs and symptoms of the baby. Further analysis, including radiographs, magnetic resonance imaging (MRI) scans, genetic testing, X-rays and CT scans can be used to confirm the diagnosis of Crouzon syndrome.
Treatment
A child with Crouzon syndrome wearing a corrective cranial band.
Surgery is typically used to prevent the closure of sutures of the skull from damaging the brain's development. Without surgery, blindness and mental retardation are typical outcomes. Craniofacial surgery is a discipline of both plastic surgery and Oral and maxillofacial surgery (OMS) . To move the orbits forward, craniofacial surgeons expose the skull and orbits and reshape the bone. To treat the midface deficiency, craniofacial surgeons can move the lower orbit and midface bones forward. For jaw surgery, either plastic surgeons or oral and maxillofacial (OMFS) surgeons can perform these operations.
Crouzon patients tend to have multiple sutures involved, most specifically bilateral coronal craniosynostoses, and either open vault surgery or strip craniectomy (if child is under 6 months) can be performed. In the later scenario, a helmet is worn for several months following surgery.
Once treated for the cranial vault symptoms, Crouzon patients generally go on to live a normal lifespan.
Epidemiology
Incidence of Crouzon syndrome is currently estimated to occur in 1.6 out of every 100,000 people.[7] There is a greater frequency in families with a history of the disorder, but that doesn't mean that everyone in the family is affected (as referred to above).
Dental significance
For dentists, this disorder is important to understand since many of the physical abnormalities are present in the head, and particularly the oral cavity. Common features are a narrow/high-arched palate, posterior bilateral crossbite, hypodontia (missing some teeth), and crowding of teeth. Due to maxillary hypoplasia,
Crouzon patients generally have a considerable permanent underbite and subsequently cannot chew using their incisors. For this reason, people with Crouzon syndrome sometimes eat in an unusual way—eating chicken drumsticks with a fork, for example, or breaking off pieces of a sandwich rather than taking a bite into it.
See also
- Apert syndrome
- Treacher Collins Syndrome
- Hearing loss with craniofacial syndromes
References
- ^ synd/1383 at Who Named It?
- ^ L. E. O. Crouzon. Dysostose cranio-faciale héréditaire. Bulletin de la Société des Médecins des Hôpitaux de Paris, 1912, 33: 545-555.
- ^ Reardon W, Winter RM, Rutland P, Pulleyn LJ, Jones BM, Malcolm S (September 1994). "Mutations in the fibroblast growth factor receptor 2 gene cause Crouzon syndrome". Nat. Genet. 8 (1): 98–103. doi:10.1038/ng0994-98. PMID 7987400.
- ^ Meyers GA, Orlow SJ, Munro IR, Przylepa KA, Jabs EW (December 1995). "Fibroblast growth factor receptor 3 (FGFR3) transmembrane mutation in Crouzon syndrome with acanthosis nigricans". Nat. Genet. 11 (4): 462–4. doi:10.1038/ng1295-462. PMID 7493034.
- ^ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0-7216-2921-0.
- ^ Vajo Z, Francomano CA, Wilkin DJ. (February 2000). "The molecular and genetic basis of fibroblast growth factor receptor 3 disorders: the achondroplasia family of skeletal dysplasias, Muenke craniosynostosis, and Crouzon syndrome with acanthosis nigricans". Endocrine Reviews 21 (1): 23–39. doi:10.1210/er.21.1.23. PMID 10696568.
- ^ Robin, NH; Falk, MJ; Haldeman-Englert, CR; Pagon, RA; Adam, MP; Ardinger, HH; Bird, TD; Dolan, CR; Fong, CT; Smith, RJH; Stephens, K (1993). "FGFR-Related Craniosynostosis Syndromes". PMID 20301628.
External links
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Wikimedia Commons has media related to Crouzon syndrome. |
- Crouzon Syndrome
- Crouzon syndrome on Genetics Home Reference from U.S. National Library of Medicine & National Institutes of Health
- GeneReviews/NIH/NCBI/UW entry on FGFR-Related Craniosynostosis Syndromes
- Crouzon Syndrome - About.com
- Crouzon Syndrome - Seattle Children's Hospital Craniofacial Center
- cleftAdvocate - Non-profit support organization for all craniofacial conditions; on-line and in-person family support, insurance and advocacy assistance, and more.
- General Information at hopkinsmedicine.org
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Congenital malformations and deformations of musculoskeletal system / musculoskeletal abnormality (Q65–Q76, 754–756.3)
|
|
Appendicular
limb / dysmelia |
| Arms |
| clavicle / shoulder: |
- Cleidocranial dysostosis
- Sprengel's deformity
- Wallis–Zieff–Goldblatt syndrome
|
|
| hand deformity: |
- Madelung's deformity
- Clinodactyly
- Oligodactyly
- Polydactyly
|
|
|
| Leg |
| hip: |
- Dislocation of hip / Hip dysplasia
- Upington disease
- Coxa valga
- Coxa vara
|
|
| knee: |
- Genu valgum
- Genu varum
- Genu recurvatum
- Discoid meniscus
- Congenital patellar dislocation
- Congenital knee dislocation
|
|
| foot deformity: |
- varus
- valgus
- Pes cavus
- Rocker bottom foot
- Hammer toe
|
|
|
| Either / both |
| fingers and toes |
- Polydactyly / Syndactyly
- Arachnodactyly
- Cenani–Lenz syndactylism
- Ectrodactyly
- Brachydactyly
|
|
| reduction deficits / limb: |
- Acheiropodia
- ectromelia
- Phocomelia
- Amelia
- Hemimelia
|
|
| multiple joints: |
- Arthrogryposis
- Larsen syndrome
- Rapadilino syndrome
|
|
|
|
| Axial |
| Skull and face |
| Craniosynostosis: |
- Scaphocephaly
- Oxycephaly
- Trigonocephaly
|
|
| Craniofacial dysostosis: |
- Crouzon syndrome
- Hypertelorism
- Hallermann–Streiff syndrome
- Treacher Collins syndrome
|
|
| other: |
- Macrocephaly
- Platybasia
- Craniodiaphyseal dysplasia
- Dolichocephaly
- Greig cephalopolysyndactyly syndrome
- Plagiocephaly
- Saddle nose
|
|
|
| Vertebral column |
- spinal curvature
- Klippel–Feil syndrome
- Spondylolisthesis
- Spina bifida occulta
- Sacralization
|
|
| Thoracic skeleton |
| ribs: |
|
|
| sternum: |
- Pectus excavatum
- Pectus carinatum
|
|
|
|
|
Index of joint
|
|
| Description |
- Anatomy
- head and neck
- cranial
- arms
- torso and pelvis
- legs
- bursae and sheathes
- Physiology
|
|
| Disease |
- Arthritis
- acquired
- back
- childhood
- soft tissue
- Congenital
- Injury
- Symptoms and signs
- Examination
|
|
| Treatment |
- Procedures
- Drugs
- rheumatoid arthritis
- gout
- topical analgesics
|
|
|
|
Cell surface receptor deficiencies
|
|
G protein-coupled receptor
(including hormone) |
| Class A |
- TSHR (Congenital hypothyroidism 1)
- LHCGR (Luteinizing hormone insensitivity, Leydig cell hypoplasia, Male-limited precocious puberty)
- FSHR (Follicle-stimulating hormone insensitivity, XX gonadal dysgenesis)
- GnRHR (Gonadotropin-releasing hormone insensitivity)
- EDNRB (ABCD syndrome, Waardenburg syndrome 4a, Hirschsprung's disease 2)
- AVPR2 (Nephrogenic diabetes insipidus 1)
- PTGER2 (Aspirin-induced asthma)
|
|
| Class B |
- PTH1R (Jansen's metaphyseal chondrodysplasia)
|
|
| Class C |
- CASR (Familial hypocalciuric hypercalcemia)
|
|
| Class F |
- FZD4 (Familial exudative vitreoretinopathy 1)
|
|
|
Enzyme-linked receptor
(including
growth factor) |
| RTK |
- ROR2 (Robinow syndrome)
- FGFR1 (Pfeiffer syndrome, KAL2 Kallmann syndrome)
- FGFR2 (Apert syndrome, Antley–Bixler syndrome, Pfeiffer syndrome, Crouzon syndrome, Jackson–Weiss syndrome)
- FGFR3 (Achondroplasia, Hypochondroplasia, Thanatophoric dysplasia, Muenke syndrome)
- INSR (Donohue syndrome
- Rabson–Mendenhall syndrome)
- NTRK1 (Congenital insensitivity to pain with anhidrosis)
- KIT (KIT Piebaldism, Gastrointestinal stromal tumor)
|
|
| STPK |
- AMHR2 (Persistent Müllerian duct syndrome II)
- TGF beta receptors: Endoglin/Alk-1/SMAD4 (Hereditary hemorrhagic telangiectasia)
- TGFBR1/TGFBR2 (Loeys–Dietz syndrome)
|
|
| GC |
- GUCY2D (Leber's congenital amaurosis 1)
|
|
|
| JAK-STAT |
- Type I cytokine receptor: GH (Laron syndrome)
- CSF2RA (Surfactant metabolism dysfunction 4)
- MPL (Congenital amegakaryocytic thrombocytopenia)
|
|
| TNF receptor |
- TNFRSF1A (TNF receptor associated periodic syndrome)
- TNFRSF13B (Selective immunoglobulin A deficiency 2)
- TNFRSF5 (Hyper-IgM syndrome type 3)
- TNFRSF13C (CVID4)
- TNFRSF13B (CVID2)
- TNFRSF6 (Autoimmune lymphoproliferative syndrome 1A)
|
|
| Lipid receptor |
- LRP: LRP2 (Donnai–Barrow syndrome)
- LRP4 (Cenani–Lenz syndactylism)
- LRP5 (Worth syndrome, Familial exudative vitreoretinopathy 4, Osteopetrosis 1)
- LDLR (LDLR Familial hypercholesterolemia)
|
|
| Other/ungrouped |
- Immunoglobulin superfamily: AGM3, 6
- Integrin: LAD1
- Glanzmann's thrombasthenia
- Junctional epidermolysis bullosa with pyloric atresia
EDAR (EDAR hypohidrotic ectodermal dysplasia)
- PTCH1 (Nevoid basal-cell carcinoma syndrome)
- BMPR1A (BMPR1A juvenile polyposis syndrome)
- IL2RG (X-linked severe combined immunodeficiency)
|
|
- See also
- cell surface receptors
|
Index of cells
|
|
| Description |
- Structure
- Organelles
- peroxisome
- cytoskeleton
- centrosome
- epithelia
- cilia
- mitochondria
- Membranes
- Membrane transport
- ion channels
- vesicular transport
- solute carrier
- ABC transporters
- ATPase
- oxidoreduction-driven
|
|
| Disease |
- Structural
- peroxisome
- cytoskeleton
- cilia
- mitochondria
- nucleus
- scleroprotein
- Membrane
- channelopathy
- solute carrier
- ATPase
- ABC transporters
- other
- extracellular ligands
- cell surface receptors
- intracellular signalling
- Vesicular transport
- Pore-forming toxins
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