What are the symptoms of Klinefelter syndrome? Males who have Klinefelter syndrome may have the following symptoms: small, firm testes, a small penis, sparse pubic, armpit and facial hair, enlarged breasts (called gynecomastia), tall stature, and abnormal body proportions (long legs, short trunk).

How is the family of a person with Klinefelter syndrome affected?

Klinefelter syndrome isn’t passed down through families like some genetic diseases. Instead, it happens randomly from an error in cell division when a parent’s reproductive cells are being formed. If one of these cells is part of a successful pregnancy, a baby boy will have the XXY condition.

What is the XXY theory?

XYY syndrome is a genetic condition that occurs when a male has an extra copy of the Y chromosome in each of their cells (XYY). Sometimes, this mutation is only present in some cells. Males with XYY syndrome have 47 chromosomes because of the extra Y chromosome.

Can you be short with Klinefelter?

About 25% of patients have fifth-finger clinodactyly. Some males with Klinefelter syndrome variant 49,XXXXY have short stature.

Is Klinefelter a disability?

If you or your dependent(s) are diagnosed with Klinefelter Syndrome and experience any of these symptoms, you may be eligible for disability benefits from the U.S. Social Security Administration.

What is Klinefelter syndrome?

Klinefelter syndrome is a condition that occurs in men as a result of an extra X chromosome. The most common symptom is infertility.

How is mosaicism assessed in Klinefelter syndrome?

To investigate the presence of a possible mosaicism, analysis of the karyotype using cells from the oral mucosa is performed. Physical characteristics of a Klinefelter syndrome can be tall stature, low body hair and occasionally an enlargement of the breast.

How many X chromosomes do you have with Klinefelter syndrome?

Females have two X chromosomes (46,XX), and males have one X and one Y chromosome (46,XY). Most often, boys and men with Klinefelter syndrome have the usual X and Y chromosomes, plus one extra X chromosome, for a total of 47 chromosomes (47,XXY).

What are the signs and symptoms of untreated Klinefelter 46/xy/47 mosaic?

A person with typical untreated Klinefelter 46,XY/47,XXY mosaic, diagnosed at age 19 – the scar from biopsy may be visible on left nipple. The primary features are infertility and small, poorly functioning testicles.