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Male Hypogonadism in Children

By

Andrew Calabria

, MD, The Children's Hospital of Philadelphia

Last full review/revision Sep 2020| Content last modified Sep 2020
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Topic Resources

Hypogonadism is decreased production of testosterone, sperm, or both in males.

  • Hypogonadism occurs when there is a problem in the testes or a problem in the pituitary gland or the hypothalamus (which signal the testes to produce testosterone and sperm).

  • Symptoms vary depending at which age the testosterone deficiency begins.

  • The diagnosis is based on an examination, blood tests, and sometimes an analysis of the chromosomes.

  • Treatment depends on the cause but may include hormone therapy.

The pituitary gland Overview of the Pituitary Gland The pituitary is a pea-sized gland that is housed within a bony structure (sella turcica) at the base of the brain. The sella turcica protects the pituitary but allows very little room for expansion... read more secretes the hormones follicle-stimulating hormone and luteinizing hormone, which are called gonadotropins. These gonadotropins stimulate the male sex organs to produce the male sex hormone testosterone and the testes to produce sperm. When testosterone is lacking, growth and sexual development may be slow, sperm production is low, and the penis may be small.

Hypogonadism can occur while a fetus is developing in the womb or can occur during early or later childhood.

There are two basic types of hypogonadism:

  • Primary hypogonadism: The testes are underactive and do not produce enough testosterone.

  • Secondary hypogonadism: The hypothalamus or pituitary gland does not secrete the hormones that stimulate the testes.

Primary Hypogonadism

Primary hypogonadism occurs when there is a problem in the testes.

Klinefelter syndrome

The syndrome is usually first identified at puberty, when inadequate sexual development is noted, or later, when infertility is investigated.

Cryptorchidism

In cryptorchidism (undescended testes Undescended Testes and Retractile Testes Undescended testes (cryptorchidism) are testes that remain in the abdomen or the groin instead of descending into the scrotum. Retractile testes (hypermobile testes) have descended into the... read more Undescended Testes and Retractile Testes ), one or both of the testes remain in the abdomen. Usually the testes descend into the scrotum shortly before birth. At birth, about 3% of boys have undescended testes, but, in most of them, the testes spontaneously descend on their own within the first 4 months of life. The cause of cryptorchidism is usually unknown.

Vanishing testes syndrome (bilateral anorchia)

Vanishing testes syndrome (bilateral anorchia) occurs in about 1 in every 20,000 male births. The testes are likely present during early development in the womb but are resorbed by the body before or shortly after birth. Without testes, children cannot produce testosterone or sperm. Without testosterone or sperm, they cannot develop male secondary sexual characteristics (such as facial hair and muscle mass) and are infertile.

Absence of Leydig cells

Absence of Leydig cells (cells in the testes that normally produce testosterone) leads to the development of partially developed genitals or ambiguous genitals. Ambiguous genitals are not clearly male or female. These defects develop because not enough testosterone is produced to stimulate the fetus to develop normal male genitals.

Noonan syndrome

Noonan syndrome Noonan Syndrome Noonan syndrome is a genetic defect that causes a number of physical abnormalities, including short stature, heart defects, and an abnormal appearance. A gene is a segment of deoxyribonucleic... read more results in small testes that do not produce enough testosterone. This syndrome is caused by a genetic abnormality that may be inherited or occur early in a developing fetus. Children may have webbing of the neck, low-set ears, short stature, shortened fourth (ring) fingers, and heart and blood vessel abnormalities.

Secondary Hypogonadism

Secondary hypogonadism occurs when there is a problem in the pituitary gland or the hypothalamus (the part of the brain that controls the pituitary gland) that prevents the pituitary gland from secreting the hormones that stimulate the testes. Some of the causes involve genetic disorders that cause many other abnormalities.

Kallmann syndrome

Kallmann syndrome is a genetic disorder that causes delayed puberty and an impaired sense of smell. Children who have this syndrome are lacking proper amounts of luteinizing hormone and follicle-stimulating hormone. Affected boys have an unusually small penis and undescended testes.

Panhypopituitarism

Panhypopituitarism is a disorder that occurs when the pituitary gland stops or decreases producing hormones. This disorder can occur when the pituitary gland is damaged (such as by a tumor or an injury). Also see Hypopituitarism Hypopituitarism Hypopituitarism is an underactive pituitary gland that results in deficiency of one or more pituitary hormones. Symptoms of hypopituitarism depend on what hormone is deficient and may include... read more .

Laurence-Moon syndrome

Laurence-Moon syndrome is a genetic disorder that causes obesity, intellectual disability, loss of vision, and extra fingers, toes, or both (polydactyly). Loss of vision occurs as the light-sensing structure at the back of the eye (the retina) gradually deteriorates (a disorder called retinitis pigmentosa Retinitis Pigmentosa Retinitis pigmentosa is a rare, progressive degeneration of the retina (the transparent, light-sensitive structure at the back of the eye) that eventually causes moderate to severe vision loss... read more ).

Isolated luteinizing hormone deficiency

Isolated luteinizing hormone deficiency occurs when only one pituitary hormone, luteinizing hormone, is missing. When luteinizing hormone is missing, the testes develop and produce sperm, because these functions are also controlled by follicle-stimulating hormone. However, the testes do not produce enough testosterone, so affected boys do not develop secondary sexual characteristics. Boys do continue to grow and may have abnormally long arms and legs.

Prader-Willi syndrome

Constitutional Delay of Puberty

Some children are normal but simply do not start puberty at the usual age, a phenomenon called constitutional delay of puberty. Children with constitutional delay of puberty are often referred to as late bloomers. Constitutional delay is more common among boys, and many children have a family history of delayed puberty in a parent or sibling.

Short stature is common during childhood and adolescence in children with constitutional delay, but at the expected time of puberty, growth often declines because the growth spurt that typically occurs at puberty is delayed. As a result, there is a noticeable difference in height between affected children and their peers during the early adolescent years. These children typically show signs of puberty by age 18 and ultimately reach a normal height and develop normally. However, the delay may cause anxiety.

Constitutional delay is not caused by hormonal or genetic problems or an underlying disorder (such as inflammatory bowel disease or eating disorders), but doctors may evaluate children to rule out other causes of short stature and delayed puberty Delayed Puberty Delayed puberty is defined as absence of the start of sexual maturation at the expected time. Most often, children simply develop later than their peers but ultimately develop normally. Sometimes... read more .

Symptoms of Male Hypogonadism

Symptoms of hypogonadism vary depending at which age the testosterone deficiency begins.

In a male fetus,testosterone deficiency before the 12th week of pregnancy causes incomplete development of the genitals. The urethra may open on the underside of the penis instead of at its end. If testosterone deficiency develops later in pregnancy, a male fetus may have an abnormally small penis or testes that do not descend into the scrotum.

A male infant may have genitals that appear less masculine (undervirilized) or appear more female, sometimes referred to as ambiguous genitalia.

In male children,testosterone deficiency that occurs at the time when puberty is expected results in incomplete sexual development. An affected boy retains a high-pitched voice and has poor muscle development for his age. The penis, testes, and scrotum are underdeveloped. Pubic and underarm hair is sparse and body hair does not exist. The breasts may enlarge (gynecomastia), and the arms and legs are abnormally long.

Diagnosis of Male Hypogonadism

  • Blood tests

  • Chromosomal analysis

Doctors suspect the diagnosis of hypogonadism when a boy has developmental abnormalities or delayed puberty. Doctors examine the boy's penis and testes to see whether they are normally developed for his age.

To confirm the diagnosis, doctors do blood tests to measure the levels of testosterone, luteinizing hormone, and follicle-stimulating hormone. The levels of luteinizing hormone and follicle-stimulating hormone help doctors determine whether hypogonadism is primary or secondary. Doctors measure levels of other hormones as well.

Treatment of Male Hypogonadism

  • Sometimes surgery

  • Replacement of hormones

Various treatments are done depending on the cause of hypogonadism.

For cryptorchidism, doctors do surgery to move the undescended testes into the scrotum, which usually enables the testes to function normally. Surgical repair helps prevent future complications.

For secondary hypogonadism, doctors treat any underlying disorder of the pituitary gland or hypothalamus. Supplements of testosterone are given, and the dose is increased over a period of 18 to 24 months.

For testosterone deficiency, as in secondary hypogonadism, doctors give adolescents injections of testosterone every 2 to 4 weeks, and the dose is increased over a period of 18 to 24 months. Testosterone can also be delivered through a patch on the skin or as a gel.

For constitutional delay of puberty, doctors may give testosterone injections for 4 to 6 months. At low doses, testosterone starts puberty, causes the development of some masculine characteristics (virilization), and does not prevent adolescents from reaching their adult height potential.

Genetic disorders cannot be cured, but hormone therapy may help sexual characteristics develop.

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