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Appendix A: Glossary of Medical Terms - page 7 / 12

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Leukopenia - The antithesis of leukocytosis; any situation in which the total number of leukocytes in the circulating blood is less than normal, the lower limit of which is generally regarded as 4000-5000 per cu mm.

Lumbosacral - Relating to the lumbar vertebrae and the sacrum.

Lumen, pl. lumina - The space in the interior of a tubular structure, such as an artery or the intestine.

Lymphadenopathy - Any disease process affecting a lymph node or lymph nodes.

Lymphopenia - A reduction, relative or absolute, in the number of lymphocytes in the circulating blood.

Macula, pl. maculae - 1. A small spot, perceptibly different in color from the surrounding tissue.  2. A small, discolored patch or spot on the skin, neither elevated above nor depressed below the skin's surface.

Mediastinitis - Inflammation of the cellular tissue of the mediastinum.

Mediastinum - The median partition of the thoracic cavity, covered by the mediastinal pleura and containing all the thoracic viscera and structures except the lungs.

Megakaryocyte - A large cell with a polyploid nucleus that is usually multilobed; megakaryocytes are normally present in bone marrow, not in the circulating blood, and give rise to blood platelets.

Melena - Passage of dark-colored, tarry stools, due to the presence of blood altered by the intestinal juices.

Meningism - A condition in which the symptoms simulate a meningitis, but in which no actual inflammation of these membranes is present.

Meningococcemia - Presence of meningococci (N. meningitidis) in the circulating blood.

Meninges - Any membrane; specifically, one of the membranous coverings of the brain and spinal cord.

Microcyst - A tiny cyst, frequently of such dimensions that a magnifying lens or microscope is required for observation.

Microscopy - Investigation of minute objects by means of a microscope.

Moribund - Dying; at the point of death.

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