Gastrointestinal: Adjective referring collectively to the stomach and small and large intestines. The commonly used abbreviation for gastrointestinal is GI. (Outside of medicine, GI can also stand for galvanized iron, general issue or government issue-as in GI Joe).
Before the extracellular matrix is calcified, the tissue is called osteoid (bone-like) tissue. When the concentrations of calcium and phosphate ions rise high enough, they are deposited into the extracellular matrix, and the bone calcifies.
Osteoid Osteoma. An osteoid osteoma is a benign (noncancerous) bone tumor that usually develops in the long bones of the body such as the femur (thighbone) and tibia (shinbone). Although osteoid osteomas can cause pain and discomfort, they do not spread throughout the body.