Fiber Type Disproportion, Congenital
National Organization for Rare Disorders, Inc.
It is possible that the main title of the report Fiber Type Disproportion, Congenital is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
- Atrophy of Type I Fibers
- Myopathy of Congenital Fiber Type Disproportion
- Myopathy, Congenital, With Fiber-Type Disproportion
Congenital fiber type disproportion (CFTD) is a rare genetic muscle disease that is usually apparent at birth (congenital myopathy). It belongs to a group of muscle conditions called the congenital myopathies that tend to affect people in a similar pattern. Major symptoms may include loss of muscle tone (hypotonia) and generalized muscle weakness. Affected infants may also have distinctive facial features. Additional common symptoms that occur include abnormal side-to-side curvature of the spine (scoliosis), delays in motor development, dislocated hips, and the permanent fixation of certain joints in a flexed position (contractures).
The diagnosis of congenital fiber type disproportion is controversial. The changes to muscle tissue that characterize the disorder can also occur in association with many other disorders or conditions including other congenital muscle disorders, Krabbe disease, Lowe's syndrome, myotonic dystrophy, fetal alcohol syndrome, and a variety of brain malformations such as cerebellar hypoplasia. These conditions should be excluded before a diagnosis of CFTD is made. Most patients with CFTD have no other affected relatives (sporadic). Some cases are inherited as an autosomal recessive or dominant trait. In one family, CFTD was inherited as an X-linked recessive trait.
March of Dimes Birth Defects Foundation
1275 Mamaroneck Avenue
White Plains, NY 10605
NIH/National Arthritis and Musculoskeletal and Skin Diseases Information Clearinghouse
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National Institute of Neurological Disorders and Stroke (NINDS)
P.O. Box 5801
Bethesda, MD 20824
European Alliance of Neuromuscular Disorders Associations
MDG Malta 4,
Gzira, Intl GAR 04
Tel: 00356 21 346688
Fax: 00356 21 318024
MUMS National Parent-to-Parent Network
150 Custer Court
Green Bay, WI 54301-1243
Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
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