Spondyloepiphyseal dysplasia (spon-dih-low-ep-ih-FIZ-ee-ul dis-PLAY-zhee-uh), or
SED, is a term that refers to a rare group of skeletal conditions that cause a type
of dwarfism in which people have shortened
trunks and limbs.
More to Know
Spondyloepiphyseal dysplasias are genetic
conditions that affect the development of bones in the spine (vertebrae) and the ends
of long bones that are near the joints. This results in short stature with a very
short trunk and limbs, although hands and feet may be more average-sized.
People with SED usually have barrel chests, short necks, and abnormal curvature
of the spine that may get worse as they age. SED also can be associated with vision
and hearing problems, clubfeet,
cleft palate, arthritis, and difficulty with the respiratory
system as the spine curvature becomes worse.
The two main types of SED are:
SED congenita, in which short stature is apparent at birth.
SED tarda, in which a lack of growth in the trunk area may
not become apparent until a child is between 5 and 10 years old.
Both types are caused by mutations in genes that are responsible for making proteins
the body needs to form cartilage and bone. Most cases of SED are due to a random mutation
in the genes, but the condition can be inherited from a parent.
Treatment for SED involves treating complications like vision loss and spinal curvature
as they arise.
Keep in Mind
There is no cure for SED, but it doesn't reduce life expectancy. People with SED
may require regular monitoring by doctors to help prevent and treat complications.
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