Extreme growth in height that begins in childhood or adolescence; also known as gigantism. Unusually tall stature may be caused by the pituitary gland overproducing growth hormone, usually due to a pituitary tumor. The excess pituitary hormone causes all parts of the body to grow extremely large. The condition differs from acromegaly in that it occurs before full maturation and the bones of the arms and legs are affected.
Unusually great height, typically considered to be greater than 200 cm in men and 180 cm in women. This condition is usually familial and may be prevented with estrogens or testosterone, depending on gender of patient.