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The pituitary gland is the gland involved in gigantism. Gigantism usually occurs in the development stage of a child. It is a serious condition where the pituitary gland develops a tumor called adenoma. This pituitary tumor (adenoma) causes the pituitary gland to secrete too much growth hormone. When too much growth hormone is secreted, the growth of muscles, bones, and other connective tissues accelerates. Children who experience this disease often have swelling in their facial features, excessively large hands and feet with thick fingers and toes. 
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