Mesothelioma Glossary H

Click on the letters below for an explanation of the glossary terms for each letter.

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Hematamesis - the vomiting of blood

Hemidiaphragm - one half of the diaphragm

Hemithorax - one side of the chest

Hemothorax - blood in the pleural space

Hemoptysis - expectoration of blood as a result of respiratory tract bleeding. It is not to be confused with blood-streaked sputum, a common complaint, but is usually benign and seen with an upper respiratory tract infection.

Hilum - the root of each lung before division into separate lobes

Histochemistry - study of the chemistry of cells and tissues by using both light and electron microscopy along with the use of special chemical tests and stains

Histology - the study of the microscopic structure of tissue

Hospice - a program that provides special care for people who are near the end of life, either at home, in freestanding facilities, or within hospitals.

Hydropneumothorax - a simultaneous collection of fluid and air in the chest cavity resulting from lung disease or penetrating injuries of the chest wall

Hyperlucency - excessive overexposure as pertaining to radiographic films

Hypertension, pulmonary - a condition resulting from increased pulmonary vascular resistance. As a consequence, the right ventricle is forced to generate a higher pulmonary artery pressure to maintain normal cardiac output.

Hypertrophy - a thickening and dilation

Hypoxia - oxygen deficiency