HDL

High-density lipoproteins. High density lipoproteins (HDL): the “good” cholesterol. HDL carry cholesterol in the blood from other parts of the body back to the liver, which leads to its removal from the body. So HDL help keep cholesterol from building up...

Hemianopsia

Loss of one half of the field of vision (the area that can be seen by each eye when staring straight ahead). Can occur in isolation or affecting both eyes. The most common form of vision loss due to pituitary tumors is loss of the outer half of vision in both...

Herniation

Bulging of tissue through an opening in a membrane, muscle or bone. A protrusion of an organ or part through connective tissue or through a wall of the cavity in which it is normally enclosed — called also rupture. A brain herniation is the displacement of brain...