The pituitary gland secretes a "growth hormone" called, according to the international nomenclature, STH (somatotropin hormone) or CH (growth hormone). this hormone is essential to allow an individual to reach a normal size in adulthood.

In some cases, this hormone is insufficiently secreted, which causes dwarfism. In others, a benign tumor of the hypophisee secretes it in excess, which in adults can cause exaggerated development of all extremities, called acromegaly.

The face of subjects with acromegaly is distorted by the abnormal volume of the nose, browbones and lower jaw, hands and feet are excessively large compared to the subject's morphology. The permanent excess of STH also causes biochemical disorders, with very frequently the appearance of diabetes. On the other hand, the activity of the testes or ovaries is blocked, causing the absence of menstruation in women and impotence in men.

Copyright photo : Par Philippe Chanson and Sylvie Salenave — Acromegaly. Orphanet Journal of Rare Diseases 2008, 3:17. doi:10.1186/1750-1172-3-17, CC BY 2.0,


Albinism is a partial or total congenital absence of pigmentation of the skin, body hair or hair. Affected subjects have an inability to tan and a significant risk of skin cancer, they must protect their skin from the sun.

Copyright photo : Par Original téléversé par Muntuwandi sur Wikipédia anglais.

Bibliography : Pediatric Retina par Springer-Verlag Berlin and Heidelberg GmbH & Co. K

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