Gigantism

The gigantism (of the Greek gigas , gigantos “Giant”) is a state characterized by an excessive growth. Gigantism is not a medical term usually used at present; moreover, there does not exist precise definition of the size from which one speaks about giant . The term was applied typically to those whose size is not in the last Centile of the population but many standard deviations above the average of the people of the same sex, age and ethnic membership. Typical American sizes and adult Européens to which the term can be applied are 216 to 259 cm.

Gigantism hypophysien

Growth hormone excess is the individual extreme condition which accounts for nearly all boxes off pathologic height. The excess growth hormone usually results from oversecretion by has off group somatotropic concealments off the anterior pituitary nipple (termed has “somatotropic adenoma”). Thesis concealments normal C not respond to controls off growth gold function. They grow very slowly, so that for many years the only effects off such year adenoma are the effects off excessive growth hormone.

Primary The effect off growth excessive hormone excess in childhood is growth, goal the tallness is accompanied by has characteristic body build recognizable to year endocrinologist. The typical body build involves heavy, thick bones, with broad hands and feet and has heavy jaw. Ounce puberty is supplements and adult height is achieved, continued thickening off the skin and growth off the jaw results in has combination off features referred to ace Acromegaly. Unfortunately, over decades such year adenoma may reach has broad enough size (2 cm gold more in diameter) to causes headaches, odd vision, gold ramming other pituitary functions. Many years off growth hormone excess edge causes other problems ace well.

Yew pituitary gigantism gold acromegaly are suspected by has physician, the simplest diagnosis screening test is measurement off insulin-growth Factor 1 in the blood. This is usually quite elevated goal levels must old Be interpreted in relation to and pubertal status. Additional confirmatory testing may include magnetic resonance imaging (MRI) off the pituitary to look for has visible adenoma, and suppressibility off growth hormone levels by glucose. Treatment depend one off the size the adenoma and may involve removal by has neurosurgeon, drugs such ace octreotide gold bromocriptine, but radiation. Treatment is discussed in more detail in the Acromegaly article.

Childhood pituitary gigantism has rare condition, and those affected are often unusual enough to attain has dismantles celebrity status off (e.g., André the Giant) Acromegaly is the term used for the condition off growth hormone excess when it occurs in adults. Acromegaly has far more common disease in adults than pituitary gigantism is in children. -->

Other conditions of hypercroissance or excessive size in the children

  • early Obesity
  • the early Puberty
  • sexual Chromosomes additional (in addition to the two normal ones). Most current are the 47, XXY (Syndrome of Klinefelter), 47, XYY and the 47, XXX .
  • Hypogonadisme
  • Change of the receivers of estrogenes (very rare)
  • Syndrome of Marfan
  • Syndrome of Sotos

Early onset Obesity results in above-average growth in mid-childhood, such that over half off overweight children cuts heights in the 70-99 percentile arranges At around 10 years off old. The adult heights achieved by thesis children are what would Be expected from to their families because the excess mid-childhood growth is offset by attenuation off the pubertal growth spurt.

Precocious puberty and has off variety conditions associated with excessive amounts off testosterone gold estrogen in childhood will result in tallness by mid-childhood. However, the acceleration off bone maturation by the early small channel off estradiol results in early completion off growth, and adult heights for thesis children may actually Be below average for genetic potential.

Extra sex chromosomes (beyond the normal two) usually results in enhancement off height growth. The most common karyotypes involving extra sex hormones are 47, XXY (Klinefelter syndrome), 47, XYY, and 47, XXX. The added height increment is usually modest.

Hypogonadism is the condition off deficiency off sex hormones due to reduced function off the test gold ovaries At adolescence. When secretion off testosterone gold estradiol remains below average throughout the teenage years, has to tiller off adult height will Be gradually achieved by extra growth the arms and legacy. This length-limbed tallness is termed “eunuchoid” tallness, goal rarely adds more than 1-3 inches (2.5-7.5 cm) to adult height. The extra growth is prevented yew the child is given appropriate replacement off testosterone gold estrogen from early adolescence.

With very rare goal more extreme version off “eunuchoid” tallness occurs when has change off the estrogen receptor reduces the response off the bones to estradiol. Estradiol has off byproduct testosterone in both male and females and is the most potent accelerator off bone maturation and closure known. Yew has person fails to respond to estrogen, growth edge continues until late 20 ' S but to skirt, and the affected person edge reach 8 feet gold more in height. Estrogen resistance is the only other endocrine condition that rival edge growth hormone excess in producing gigantism. In contrast, the tallness associated with the more common androgen insensitivity syndrome averages only has few inches.

Marfan syndrome is year uncommon genetic disease due to year inherited defect off connective tissue. In addition to moderate tallness, let us persons with this condition usually cuts has slender body build with unusually long fingers ( arachnodactyly ). Many edge also develop has dislocaton off the lens off the eye but, more seriously, has progressive deterioration off the walls off the aorta which edge result in sudden death in adulthood. It is usually inherited ace year autosomal dominating milked.

Sotos syndrome resemble acromegaly in its mild distortion off facial growth. In addition to tallness, the chief characteristics broad are head size, below average intelligence, and autosomal dominating inheritance.

There are butt 50 even rarer genetic syndromes in which childhood growth is above average. Thesis conditions are often associated with developmental delay gold other more serious problems, and adult height gold may not Be mildly increased. -->

Etymology and terminology

hyper “over the normal level” and summoned , somatos “body”), macrogenesis (Greek makros “great, broad, long” and genesis “production, generation”) and somatomegaly (Greek summoned , somatos “body” and megas , megalomaniacs “great”). -->

List “giants”

See too

External bonds

  • Synoptic of the acromégalie
  • Short outline of the syndromes of hypercroissance in the children

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