gigantism


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gigantism,

condition in which an animal or plant is far greater than normal in size. Plants are often deliberately bred to increase their size. However, among animals, gigantism is usually the result of hereditary and glandular disturbance. Among humans, gigantism is produced by an oversecretion of growth hormones by the acidophilic cells in the anterior lobe of the pituitary, causing excessive growth of all the tissues of the body. The metabolic rate is usually at least 20% above normal, which could be caused by an excess of the growth hormone alone, or oversecretion of the thyroid hormone in addition. Usually hyperglycemia (overactivity of the insulin-producing cells of the pancreas) is present. This condition eventually leads to degeneration of the islet cells, causing diabetes. Because of these metabolic abnormalities, the life expectancy of a giant is considerably less than normal. The treatment for gigantism is usually irradiation of the pituitary. The excessive height of the pituitary giant, which is defined at various levels above 7 ft (213 cm), is caused by excessive growth of the long bones. However, if the pituitary becomes overactive after growth is complete (marked by closure of the epiphyses of the long bones), the condition known as acromegalyacromegaly
, adult endocrine disorder resulting from hypersecretion of growth hormone produced by the pituitary gland. Since the bones cannot increase in length after full growth is attained, there is a disproportionate thickening of bones, predominantly in the skull and small
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 results. Giantsgiant,
in mythology, manlike being of great size and strength. The giant has been the symbol for the expression of certain recurring beliefs in the mythologies of all races.
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 appear in the legends and folklore of many cultures.

Gigantism

 

excessive growth in humans. A height exceeding 190 cm may acquire a pathological character. Giants over 200 cm tall are rarely encountered; the tallest human described in the literature was 320 cm tall. Gigantism is observed more often in males, is usually manifested at nine-ten years of age or during the period of sexual maturation, and continues during the physiological growth of the body. The causes of gigantism are not known; it is presumed that it is connected with intensified function of the anterior pituitary gland, which produces the growth hormone. Giants of pathological height experience poor health and rarely live to old age. They are often psychologically infantile, and their sex drive is absent or decreased. Externally, there is elongation of the extremities, especially the lower ones; the head appears unusually small. There exists partial gigantism, which is characterized by the enlargement of part (for example, the feet) or half of the body. Treatment includes X-ray and hormone therapy, sometimes surgery.

gigantism

[jī′gan‚tiz·əm]
(medicine)
Abnormal largeness of the body due to hypersecretion of growth hormone.
References in periodicals archive ?
A first phylogenetic analysis of giant pill-millipedes (Diplopoda: Sphaerotheriida), a new model Gondwanan taxon, with special emphasis on island gigantism.
Five cases of prehistoric Peruvian gigantism, in N.
It was true that in the early 1980s, issues such as managing Olympic gigantism and feminizing events, as well as monitoring inclusion of new sports and progressively opening up to professional athletes comprised the major challenges of the Olympic organization.
The twenty-first century American secessionist movement emerged out of exactly this historical context--that is, out of conscious rejection of American gigantism.
This effort could give way to gigantism in the national monuments that tried to make sense out of the mass slaughters of industrialized warfare.
She suffers from gigantism, a condition which makes her body grow uncontrollably.
However, gigantism is not intrinsically linked to numbers.
controlled - as if the analogous cancer and gigantism weren't in the end equally undesirable.
Taniguchi's design--a mixture of gigantism and chilliness masquerading as elegance-reinforces this tenuousness.
Novartis, Basel, Switzerland, has announced that the Japanese health authority has approved Sandostatin LAR (octreotide acetate for injectable suspension) for the treatment of acromegaly and pituitary gigantism which is unresponsive to or unsuitable for surgery or other drug therapies, and for symptoms associated with gastrointestinal hormone secreting tumors (also known as gastroenteropancreatic (GEP) neuroendocrine tumors (NET), including carcinoid tumors, gastrinomas, and VIPomas (Vasoactive Intestinal Peptide- secreting tumors).