41. NIMH Child Psychiatry Branch KLINEFELTER SYNDROME klinefelter syndrome (KS) and other Sex Chromosome Variations (SCV). Understandingklinefelter syndrome A Guide for XXY Males and Their Families. http://intramural.nimh.nih.gov/research/chp/xxy/

Klinefelter Syndrome (KS) and other Sex Chromosome Variations (SCV) Child Psychiatry Branch Childhood Schizophrenia ADHD Brain Imaging Research ... Branch Staff Jay N. Giedd, MD Principal Investigator The Child Psychiatry Branch of the National Institute of Mental Health is conducting a study of the effects of sex chromosomes on brain development. This study hopes to determine whether brain-imaging studies of children with sex chromosome variations will help uncover core biological features of these chromosomal conditions. Male volunteers aged 5-25 with any sex chromosome variation (XXY, XYY, XXYY, XXXY, XXXXY) are needed to participate in this study. Participation involves coming to the National Institutes of Health (NIH) in Bethesda, Maryland (just outside of Washington D.C.) for a one-day visit, which will include: an interview a brief physical exam cognitive testing a blood draw for genotyping and a brain magnetic resonance imaging (MRI) scan (the MRI scan provides detailed images of the brain without the use of radiation) We also ask that the child and parents return 2 years after the first visit for a follow-up MRI.

42. Klinefelter Syndrome - Pediatrics klinefelter syndrome. Dateline 06/26/99. Doctors are syndrome . KlinefelterSyndrome or XXY Male is a common genetic abnormality. There http://pediatrics.about.com/library/weekly/aa062699.htm

zfp=-1 About Pediatrics Search in this topic on About on the Web in Products Web Hosting Pediatrics with Vincent Iannelli, M.D. Your Guide to one of hundreds of sites Home Articles Forums ... Help zmhp('style="color:#fff"') Subjects ESSENTIALS 2003 Immunization Schedule Polls and Quizzes Growth Charts ... All articles on this topic Stay up-to-date! Subscribe to our newsletter. Advertising Free Credit Report Free Psychics Advertisement Klinefelter Syndrome Dateline: 06/26/99 Doctors are trying to get away from calling this a "syndrome". Klinefelter Syndrome or XXY Male is a common genetic abnormality. There are few clinical manifestations and a person may live for-years-or-forever without anyone knowing he has it. In this condition the patient looks male but the sex chromosome make up is XXY instead of XY. (There are also other, less common, chromosomal variations.) Klinefelters is occasionally diagnosed prenatally when cells are analyzed for chromosome abnormalities during pregnancy (through amniocentesis or chorionic villus sampling). Sometimes the diagnosis is made during puberty because of the noticeable and potentially embarrassing physical signs which include enlarged breasts, little body hair and extra height. Testes are small and there is a tendency toward androgen deficiency. Affected males are usually sterile. The benefit of knowing early that a baby or child has Klinefelters is that parents can be alert for signals that a child may need medical or developmental intervention. Most symptoms are treatable and early intervention can prevent developmental and educational difficulties.

43. Klinefelter Syndrome klinefelter syndrome. Definition. klinefelter syndrome is a chromosomedisorder in males. People with this condition are http://www.healthatoz.com/healthatoz/Atoz/ency/klinefelter_syndrome.html

Encyclopedia Index K Home Encyclopedia Encyclopedia Index K Klinefelter syndrome Definition Klinefelter syndrome is a chromosome disorder in males. People with this condition are born with at least one extra X chromosome. Description Klinefelter syndrome is a condition where one or more extra X-chromosomes are present in a male. Boys with this condition appear normal at birth. They enter puberty normally, but by mid puberty have low levels of testosterone causing small testicles and the inability to make sperm. Affected males may also have learning disabilities and behavior problems such as shyness and immaturity and at an increased risk for certain other health problems. Klinefelter syndrome is one of the most common chromosomal abnormalities. About 1 in every 500 to 800 males is born with this disorder. Approximately 3% of the infertile male population have Klinefelter syndrome. Causes and symptoms Chromosomes are found in the cells in the body. Chromosomes contain genes, structures that tell the body how to grow and develop. Chromosomes are responsible for passing on hereditary traits from parents to child. Chromosomes also determine whether the child will be male or female. Normally, a person has a total of 46 chromosomes in each cell, two of which are responsible for determining that individual's sex. These two sex chromosomes are called X and Y. The combination of these two types of chromosomes determines the sex of a child. Females have two X chromosomes (the XX combination); males have one X and one Y chromosome (the XY combination).

44. 1Up Health > Klinefelter Syndrome > Causes, Incidence, And Risk Factors Of Kline Comprehesive information on klinefelter syndrome (47 XXY syndrome). Klinefeltersyndrome Causes, Incidence, and Risk Factors. Alternative names http://www.1uphealth.com/health/klinefelter_syndrome_info.html

1Up Health Klinefelter syndrome Alternative Medicine Clinical Trials ... Health Topics A-Z Search 1Up Health Klinefelter syndrome Information Klinefelter syndrome Causes, Incidence, and Risk Factors Alternative names : 47 X-X-Y syndrome Definition : A chromosome abnormality that affects only men and causes hypogonadism Causes, Incidence, and Risk Factors Klinefelter syndrome is caused by an extra X chromosome and affects only males. An infant appears normal at birth, but the defect usually becomes apparent in puberty when secondary sexual characteristics fail or are late to develop, and testicular changes occur that eventually result in infertility in the majority of those affected. Some mild cases may go undetected with no abnormalities present except infertility. Increased maternal age is a risk factor. It is usually a sporadic event, not inherited, that leads to the extra X chromosome. Previous Next Jump to Another Section of this Guide Definition Causes, Incidence, and Risk Factors Symptoms Diagnosis, Signs, and Tests

45. Klinefelter Syndrome klinefelter syndrome klinefelter syndrome. klinefelter syndrome occurs in 1 in 500to 1 in 1000 live births. klinefelter syndrome and Associates. Turner Center. http://gslc.genetics.utah.edu/units/disorders/karyotype/klinefelter.cfm

Genetic Science Learning Center at the Eccles Institute of Human Genetics University of Utah Home ... What Can Our Chromosomes Tell Us? Klinefelter Syndrome Klinefelter Syndrome Klinefelter Syndrome occurs in 1 in 500 to 1 in 1000 live births. People with this disorder develop as males with subtle characteristics that become apparent during puberty. They are often tall and usually do not develop secondary sex characteristics such as facial hair, or underarm and pubic hair. Men and boys with Klinefelter Syndrome have a Y chromosome and 2 X chromosomes. This is an example of trisomy Where does the extra chromosome come from? In about half of Kleinfelter cases, the extra X chromosome is from the mother's egg, while in the other half of cases the extra chromosome is from the father's sperm. Additional Resources Klinefelter Syndrome and Associates Turner Center

46. Klinefelter Syndrome MAIN SEARCH INDEX klinefelter syndrome. Definition. klinefelter syndromeis a chromosome disorder in males. People with this condition http://www.hendrickhealth.org/healthy/000797.htm

MAIN SEARCH INDEX Klinefelter syndrome Definition Description Causes and symptoms Diagnosis ... Resources Definition Klinefelter syndrome is a chromosome disorder in males. People with this condition are born with at least one extra X chromosome. Description Klinefelter syndrome is a condition where one or more extra X-chromosomes are present in a male. Boys with this condition appear normal at birth. They enter puberty normally, but by mid puberty have low levels of testosterone causing small testicles and the inability to make sperm. Affected males may also have learning disabilities and behavior problems such as shyness and immaturity and at an increased risk for certain other health problems. Klinefelter syndrome is one of the most common chromosomal abnormalities. About 1 in every 500 to 800 males is born with this disorder. Approximately 3% of the infertile male population have Klinefelter syndrome. Causes and symptoms Chromosomes are found in the cells in the body. Chromosomes contain genes, structures that tell the body how to grow and develop. Chromosomes are responsible for passing on hereditary traits from parents to child. Chromosomes also determine whether the child will be male or female. Normally, a person has a total of 46 chromosomes in each cell, two of which are responsible for determining that individual's sex. These two sex chromosomes are called X and Y. The combination of these two types of chromosomes determines the sex of a child. Females have two X chromosomes (the XX combination); males have one X and one Y chromosome (the XY combination).

47. KLINEFELTER SYNDROME 47XXY klinefelter syndrome 47XXY. klinefelter syndrome SAN DIEGO AREA SUPPORTGROUP POB 600112 SAN DIEGO, CALIFORNIA 921600012 619-595-3884 http://hometown.aol.com/bear4u2c/

48. Klinefelter Syndrome klinefelter syndrome (or XXY syndrome) is a chromosome disorder that affectsmales. The affected syndrome. klinefelter syndrome. Klinefelter http://www.disability.vic.gov.au/dsonline/dsarticles.nsf/pages/Klinefelter_syndr

49. © The Centre For Genetics Education CHROMOSOMAL DISORDERS II klinefelter syndrome - XXY. Produced bythe Centre for Genetics Education. WHAT IS klinefelter syndrome? http://www.genetics.com.au/Genetics2003/FactSheets/24b.asp

GENETIC FACT SHEETS Fact Sheet 24b Last Updated: May 2002 CHROMOSOMAL DISORDERS II - KLINEFELTER SYNDROME - XXY Produced by the Centre for Genetics Education. Fax: (02) 9906 7529 Email: genetics@med.usyd.edu.au Internet: www.genetics.com.au Adobe Acrobat PDF Printable Version (12 KB) More detailed information relevant to this Fact Sheet can be found in Fact Sheets: 1, 10a ,11 and 12a. WHAT IS KLINEFELTER SYNDROME? Klinefelter syndrome is the name given to a condition in which there is a characteristic group of symptoms including the tendency to develop breasts, sparse facial hair, and an inability to produce sperm. The condition only affects boys. An additional X chromosome is found in the cells of these affected boys, giving them two X chromosomes instead of the usual one. The syndrome was first described in 1942 by Dr Harry Klinefelter and it was later given his name. Klinefelter syndrome is one of the more common genetic conditions and occurs in between 1 in 500 and 1 in 1000 males. WHAT CAUSES KLINEFELTER SYNDROME? Klinefelter syndrome is the result of a mistake in cell division either at the time of conception or soon after. Males usually have one X chromosome which they receive from their mother and a Y chromosome which they receive from their father. These are called the sex chromosomes. They also have 22 pairs of autosomes (chromosomes which are not sex chromosomes), one of each pair from mother and the other from father. Therefore, there are 46 chromosomes altogether in every cell of the body and this is written as 46,XY.

50. Klinefelter Syndrome klinefelter syndrome. Definition Causes, incidence, and risk factors Klinefeltersyndrome is caused by an extra X chromosome and affects only males. http://www.pennhealth.com/ency/article/000382.htm

Disease Injury Nutrition Poison ... Prevention Klinefelter syndrome Definition: A chromosome abnormality that affects only men and causes hypogonadism Alternative Names: 47 X-X-Y syndrome Causes, incidence, and risk factors: Klinefelter syndrome is caused by an extra X chromosome and affects only males. An infant appears normal at birth, but the defect usually becomes apparent in puberty when secondary sexual characteristics fail or are late to develop, and testicular changes occur that eventually result in infertility in the majority of those affected. Some mild cases may go undetected with no abnormalities present except infertility. Increased maternal age is a risk factor. It is usually a sporadic event, not inherited, that leads to the extra X chromosome. Review Date: 8/31/2001 Reviewed By: David G. Brooks, M.D., Ph.D., Division of Medical Genetics, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network.

51. Understanding Klinefelter Syndrome Understanding klinefelter syndrome A Guide for XXY Males and Their Families.What is klinefelter syndrome? In 1942, Dr. Harry Klinefelter http://www.clevelandclinic.org/health/health-info/docs/0800/0852.asp?index=5485

52. Health Library - Klinefelter Syndrome Saint Luke's Health System eLibrary. klinefelter syndrome. Self Help Clearinghouse.klinefelter syndrome and Associates. National network. http://hvelink.saint-lukes.org/library/healthguide/SelfHelp/topic.asp?hwid=shc29

53. Health Library - Klinefelter Syndrome klinefelter syndrome. Self Help Clearinghouse. klinefelter syndromeand Associates. National network. 4 affiliated groups. http://yalenewhavenhealth.org/Library/HealthGuide/SelfHelp/topic.asp?hwid=shc29k

54. Diseases And Conditions -- Discovery Health -- Klinefelter Syndrome klinefelter syndrome is a genetic disorder that occurs in males who have threeor more sex chromosomes. klinefelter syndrome affects only males. http://health.discovery.com/diseasesandcond/encyclopedia/1600.html

Klinefelter syndrome By Ronald J. Jorgenson, DDS, PhD, FACMG Klinefelter syndrome is a genetic disorder that occurs in males who have three or more sex chromosomes. At least two of the chromosomes must be X chromosomes, and one must be a Y chromosome. The condition causes males to have some female-like physical features. What is going on in the body? Klinefelter syndrome affects only males. The presence of the Y chromosome assures that male sexual features will be present. Because males with Klinefelter syndrome don't have the normal number of chromosomes, the body's natural balance is upset. The upset in balance leads to: underdevelopment of the testicles, a condition called hypogonadism , which usually leads to infertility a taller-than-average height and a feminine body build Klinefelter syndrome usually does not cause mental retardation , but affected males test slightly lower than their brothers and sisters on IQ testing. They also may have problems talking and hearing. What are the signs and symptoms of the condition? A person with this condition may: be tall have small testicles have a female-like body build, including breasts

55. Health Library - Klinefelter Syndrome klinefelter syndrome. Self Help Clearinghouse. klinefelter syndromeand Associates. National network. 4 affiliated groups. http://www.laurushealth.com/library/healthguide/selfhelp/topic.asp?hwid=shc29kln

56. Klinefelter Syndrome Back Home Next. klinefelter syndrome Gynecomastia and Klinefelter's Syndrome Surgical Correction. Klinefelter klinefelter syndrome Support. Klinefelter http://www.ability.org.uk/Klinefelter_Syndrome.html

Our Aims Services Stats ... Z Klinefelter Syndrome Gynecomastia and Klinefelter's Syndrome - Surgical Correction - XXY, Variants and Klinefelter Syndrome. Information and letters from other parents and men who are XXY or a variant. Klinefelter Syndrome Support Klinefelter Syndrome treatment, prevention and much more Medical information site on XXY (Klinefelter syndrome). Understanding Klinefelter Syndrome ... Webmaster . Site Design by Ability "see the ability, not the disability" Acknowledgments

57. Klinefelter Syndrome Back Home Next. klinefelter syndrome. Gynecomastia and Klinefelter's Syndrome Surgical Correction. klinefelter syndrome XXY A Parents View. http://www.ability.org.uk/Sleep_Disorders.html

"see the ability, not the disability" You to can help support the Ability Project by: Our Aims ... Z Klinefelter Syndrome Gynecomastia and Klinefelter's Syndrome - Surgical Correction Klinefelter Syndrome Support - Educational and support information about Klinefelter Syndrome/XXY and its variants. Klinefelter Syndrome treatment, prevention and much more Medical information site on XXY (Klinefelter syndrome). Understanding Klinefelter Syndrome - Also known as "XXY males" these persons have an extra sex chromosome, XXY instead of the usual male arrangement, XY. Many men go through life without any symptoms or knowledge of this genetic difference. This site explains causes, symptoms, treatments and resources. Webmaster . Site Design by Ability "see the ability, not the disability" Acknowledgments

58. Klinefelter Syndrome Articles, Support Groups, And Resources klinefelter syndrome articles, support groups, and resources for patientsfrom Med Help International (www.medhelp.org). klinefelter syndrome. http://www.medhelp.org/HealthTopics/Klinefelter_Syndrome.html

[Health Topics A-Z] A B C D ... Z Klinefelter Syndrome Ask The Doctor Forums Klinefelter Syndrome (Neurology and Neurosurgery Forum) Support Groups: Klinefelter Syndrome and Associates Klinefelter Syndrome Support Group [Med Help Home] [Library Search] ... [Patient Network] Revised: 3/30/2003

59. The Klinefelter Syndrome And Associates Has Moved As Of January 1 The klinefelter syndrome and Associates has moved as of January 1,1997 to their very own domain at WWW.GENETIC.ORG. Click on the http://www.medhelp.org/web/ks.htm

The Klinefelter Syndrome and Associates has moved as of January 1, 1997 to their very own domain at: WWW.GENETIC.ORG Click on the link above to go there and then please update your bookmarks! Thanks Med Help for the lift!

60. Klinefelter Syndrome | Building Better Health You are here Home Health A to Z klinefelter syndrome Health Topics AZ KlinefelterSyndrome. klinefelter syndrome is a chromosome disorder in males. http://www.buildingbetterhealth.com/topic/topic100587055

Medical Library Cool Tools Women's Health Men's Health ... Drug Dictionary You are here: Home Health A to Z Health Topics A-Z Klinefelter Syndrome Carson-DeWitt, Rosalyn S. Below: Definition Description Causes and symptoms Diagnosis ... Resources Definition Klinefelter syndrome is a chromosome disorder in males. People with this condition are born with at least one extra X chromosome. Description Klinefelter syndrome is a condition where one or more extra X-chromosomes are present in a male. Boys with this condition appear normal at birth. They enter puberty normally, but by mid puberty have low levels of testosterone causing small testicles and the inability to make sperm. Affected males may also have learning disabilities and behavior problems such as shyness and immaturity and at an increased risk for certain other health problems. Klinefelter syndrome is one of the most common chromosomal abnormalities. About 1 in every 500 to 800 males is born with this disorder. Approximately 3% of the infertile male population have Klinefelter syndrome. Causes and symptoms Chromosomes are found in the cells in the body. Chromosomes contain genes, structures that tell the body how to grow and develop. Chromosomes are responsible for passing on hereditary traits from parents to child. Chromosomes also determine whether the child will be male or female. Normally, a person has a total of 46 chromosomes in each cell, two of which are responsible for determining that individual's sex. These two sex chromosomes are called X and Y. The combination of these two types of chromosomes determines the sex of a child. Females have two X chromosomes (the XX combination); males have one X and one Y chromosome (the XY combination).

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