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Most persons with Pfeiffer syndrome type 1 have a normal intelligence and life span; types 2 and 3 typically cause neurodevelopmental disorders and early death. Later in life, surgery can help in bone formation and facial construction. Pfeiffer syndrome affects about 1 in 100,000 persons.
Acrocephalosyndactyly. Acrocephalosyndactyly is a group of congenital conditions characterized by irregular features of the face and skull ( craniosynostosis) and hands and feet ( syndactyly ). [1] Craniosynostosis occurs when the cranial sutures, the fibrous tissue connecting the skull bones, fuse the cranial bones early in development.
In achondroplasia, the mutated form of the receptor is constitutively active, and this leads to severely shortened bones. This is an example of a gain of function mutation. The effect is genetically dominant , with one variant of the FGFR3 gene being sufficient to cause achondroplasia, while two copies of the mutant gene are invariably fatal ...
The paternal age effect is the statistical relationship between the father's age at conception and biological effects on the child. [1] Such effects can relate to birthweight, congenital disorders, life expectancy and psychological outcomes. [2] A 2017 review found that while severe health effects are associated with higher paternal age, the ...
Kleeblattschaedel. Kleeblattschaedel is a rare malformation of the head where there is a protrusion of the skull and broadening of the face. [2] This condition is a severe type of craniosynostosis. [3] The condition can be both isolated or associated with other craniofacial dysostosises. [4] 85% of children with this condition have other ...
Medical genetics. Osteopetrosis, literally "stone bone", also known as marble bone disease or Albers-Schönberg disease, is an extremely rare inherited disorder whereby the bones harden, becoming denser, in contrast to more prevalent conditions like osteoporosis, in which the bones become less dense and more brittle, or osteomalacia, in which ...
Cardiocranial syndrome, Pfeiffer type is a rare multiple disorder syndrome characterized by congenital heart defects, sagittal craniosynostosis, and severe developmental delay. The condition has been reported in less than 10 patients worldwide. Signs and symptoms. Features of this condition include: Abnormal heart morphology
Patients with Crouzon syndrome sometimes exhibit malformations of the external ear and/or the middle ear, such as malalignment of the pinna (Peterson-Falzone et al., 2001). Literature has suggested that persons with Crouzon syndrome typically have conductive hearing loss caused by middle ear effusion (or fluid in the middle ear) and perforation ...