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GIST Support International - Glossary of Terms
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hamartomaBenign, tumor-like but non-cancerous overgrowth of tissue that is disordered in structure.
hematemesisVomiting of blood.
hematopoietic or hemapoieticReferring to or promoting the formation and development of blood cells.
hemorrhageBleeding. Small hemorrhages are classified according to size as petechiae (very small), purpura (up to 1 cm), and ecchymoses (larger).
histologyThe study of cells and tissue on the microscopic level. Also called microscopic anatomy, it deals with the minute structure, composition, and function of the tissues.
hyperpigmentationAbnormally increased pigmentation in a body part or tissue (such as the skin).
hyperplasiaAn abnormal or unusual increase in the number of normal cells in normal arrangement in a tissue.

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