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Caudal regression syndrome, or sacral agenesis (or hypoplasia of the sacrum), is a rare birth defect. It is a congenital disorder in which the fetal development of the lower spine—the caudal partition of the spine—is abnormal. [1] It occurs at a rate of approximately one per 60,000 live births. [2]
Without treatment, it is a highly life-threatening condition, so prognosis is poor. [35] [34] If surgery isn't performed in severe cases, the child can (and will) die, since the phenotype of pulmonary atresia is not compatible with life due to the pulmonary valve atresia resulting in reduced blood oxygenation. [9] [62] [63]
Agenesis of the corpus callosum (ACC) is a rare birth defect in which there is a complete or partial absence of the corpus callosum. It occurs when the development of the corpus callosum, the band of white matter connecting the two hemispheres in the brain , in the embryo is disrupted.
Malouf syndrome (also known as "congestive cardiomyopathy-hypergonadotropic hypogonadism syndrome") is a congenital disorder that causes one or more of the following symptoms: intellectual disability, ovarian dysgenesis, congestive cardiomyopathy, broad nasal base, blepharoptosis, and bone abnormalities, and occasionally marfanoid habitus (tall stature with long and thin limbs, little ...
Seckel syndrome, or microcephalic primordial dwarfism (also known as bird-headed dwarfism, Harper's syndrome, Virchow–Seckel dwarfism and bird-headed dwarf of Seckel [1]) is an extremely rare congenital nanosomic disorder. Inheritance is autosomal recessive. [2]
The Trilogy of Fallot also called Fallot's trilogy is a rare congenital heart disease consisting of the following defects: pulmonary valve stenosis, right ventricular hypertrophy and atrial septal defect. [1] It occurs in 1.2% of all congenital heart defects. [2]
Cloacal exstrophy is a rare birth defect, present in 1/200,000 pregnancies and 1/400,000 live births. It is associated with a defect of the ventral body wall and can be caused by inhibited mesodermal migration. [4] The defect can often be comorbid with spinal bifida and kidney abnormalities. [5]
Birth defects are divided into two main types: structural disorders in which problems are seen with the shape of a body part and functional disorders in which problems exist with how a body part works. [3] Functional disorders include metabolic and degenerative disorders. [3] Some birth defects include both structural and functional disorders. [3]