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- $Unique_ID{BRK03849}
- $Pretitle{}
- $Title{Hypochondroplasia}
- $Subject{Hypochondroplasia Atypical Achondroplasia Achondroplasia Tarda
- Achondroplasia Kozlowski's Spondylometaphyseal Dysplasia }
- $Volume{}
- $Log{}
-
- Copyright (C) 1988, 1989 National Organization for Rare Disorders, Inc.
-
- 591:
- Hypochondroplasia
-
- ** IMPORTANT **
- It is possible that the main title of the article (Hypochondroplasia) is
- not the name you expected. Please check the SYNONYM listing to find the
- alternate names and disorder subdivisions covered by this article.
-
- Synonyms
-
- Atypical Achondroplasia
- Achondroplasia Tarda
-
- Information on the following diseases can be found in the Related
- Disorders section of this report:
-
- Achondroplasia
- Kozlowski's Spondylometaphyseal Dysplasia
-
- General Discussion
-
- ** REMINDER **
- The information contained in the Rare Disease Database is provided for
- educational purposes only. It should not be used for diagnostic or treatment
- purposes. If you wish to obtain more information about this disorder, please
- contact your personal physician and/or the agencies listed in the "Resources"
- section of this report.
-
- Hypochondroplasia is an inherited skeletal disorder. Major symptoms
- include dwarfism that does not become evident until mid-childhood. The
- disorder is characterized by a normal sized head and small but normally
- shaped hands and feet.
-
- Symptoms
-
- Hypochondroplasia can be distinguished from other forms of short limb
- dwarfism by examination of the bone structure of the skull and long bones of
- the arms and legs of affected children. The children appear normal at birth
- but the limbs fail to develop properly. The body thickens and is shorter
- than normal. The head is of normal size but the hands and feet are smaller
- than normal. The arms and legs are shorter than normal and are not usually
- bowed. There is limited flexibility in the elbows. Intelligence is usually
- normal, although motor development may be slowed.
-
- Causes
-
- Hypochondroplasia is inherited as an autosomal dominant trait. (Human traits
- including the classic genetic diseases, are the product of the interaction of
- two genes for that condition, one received from the father and one from the
- mother. In dominant disorders a single copy of the disease gene (received
- from either the mother or father) will be expressed "dominating" the other
- normal gene and resulting in appearance of the disease. The risk of
- transmitting the disorder from affected parent to offspring is fifty percent
- for each pregnancy regardless of the sex of the resulting child.) Symptoms
- may develop due to failure of the limbs to grow normally.
-
- Affected Population
-
- Hypochondroplasia is a rare skeletal disorder that appears to affect females
- more often than males.
-
- Related Disorders
-
- Symptoms of the following disorders can be similar to those of
- Hypochondroplasia. Comparisons may be useful for a differential diagnosis:
-
- Achondroplasia is a form of short limbed dwarfism that is apparent at
- birth. It is characterized by bulging head, marked saddling of the nose and
- a certain facial characteristics. The body is shorter than normal with
- disproportioned arms and legs and thickened bones. Fingers that are very
- short and pudgy with "trident hands" and similar deformities of the toes and
- feet also occur. Other symptoms may include an abnormally curved back or
- spine and other abnormalities of the bone or cartilage. In some cases there
- are serious neurologic complications in early adulthood. (For more
- information on this disorder, choose "Achondroplasia " as your search term in
- the Rare Disease Database).
-
- Kozlowski's Spondylometaphyseal Dysplasia is characterized by reduced
- calcification of the bones, especially of the spine and pelvis. Onset is
- usually during the first year of life and is evident by the age two. It is
- an anterior deformity in the spine with limited growth and joint degeneration
- producing a waddling gait, short neck and trunk, bowed legs, pain and limited
- range of motion. This disorder affects both sexes equally.
-
- Therapies: Standard
-
- Treatment of Hypochondroplasia may consist of physical therapy or orthopedic
- corrections. Caesarean section deliveries may be necessary for patients who
- are pregnant. Genetic counseling may be of benefit for patients and their
- families. Other treatment is symptomatic and supportive.
-
- Therapies: Investigational
-
- This disease entry is based upon medical information available through
- November 1988. Since NORD's resources are limited, it is not possible to
- keep every entry in the Rare Disease Database completely current and
- accurate. Please check with the agencies listed in the Resources section for
- the most current information about this disorder.
-
- Resources
-
- For more information on Hypochondroplasia, please contact:
-
- National Organization for Rare Disorders (NORD)
- P.O. Box 8923
- New Fairfield, CT 06812-1783
- (203) 746-6518
-
- International Center for Skeletal Dysplasia
- St. Joseph Hospital
- 7620 York Road
- Towson, MD 21204
- (301) 337-1250
-
- The National Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
- Information Clearinghouse
- Box AMS
- Bethesda, MD 20892
- (301) 495-4484
-
- The Magic Foundation
- 1327 N. Harlem Ave.
- Oak Park, IL 60302
- (708) 383-0808
-
- Human Growth Foundation (HGF)
- 7777 Leesburg Pike
- P.O. Box 3090
- Falls Church, VA 22043
- (703) 883-1773
- (800) 451-6434
-
- Parents of Dwarfed Children
- 11524 Colt Terrace
- Silver Spring, MD 20902
-
- Little People of America
- P.O. Box 633
- San Bruno, CA 94066
- (415) 589-0695
-
- Short Stature Foundation
- 17200 Jamboree Rd., Suite J
- Irvine, CA 92714-5828
- (714) 474-4554
- 800-24 DWARF
-
- For Genetic Information and genetic counseling referrals:
-
- March of Dimes Birth Defects Foundation
- 1275 Mamaroneck Avenue
- White Plains, NY 10605
- (914) 428-7100
-
- Alliance of Genetic Support Groups
- 35 Wisconsin Circle, Suite 440
- Chevy Chase, MD 20815
- (800) 336-GENE
- (301) 652-5553
-
- References
-
- MENDELIAN INHERITANCE IN MAN, 7th ed.: Victor A. McKusick; Johns Hopkins
- University Press, 1986. Pp. 408.
-
- HYPOCHONDROPLASIA, E.E. Specht, et al., Clin Orthop (July-August, 1975,
- issue (110)). Pp. 249-255.
-
- HYPOCHONDROPLASIA, D.E. Newman, et al., J Can Assoc Radiol (June, 1975,
- issue 26 (2)). Pp. 95-103.
-
- ACHONDROPLASIA AND HYPOCHONDROPLASIA. CLINICAL VARIATION AND SPINAL
- STENOSIS, R. Wynne-Davies, et al., J Bone Joint Surg [Br.] (1981, issue 63B
- (4)). 508-515.
-
-