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[[Skeudenn:Mediastinum.png|right|thumb|Tresadenn eus ar mediastinum.]]
Ar '''mediastinum''', pe '''poullkreiz''', zo anezhañ ul lodenn eus [[kavenn ar brusk (mab-den)|kavenn ar brusk]] zo etre div lodenn ar [[skevent]]. Ennañ emañ ar [[kalon|galon]], <!-- an [[œsophagetreizher]], anar [[trachéebriant|vriant]] --> hag an div [[bronkez|vronkezenn]] vras. Tremen a ra ivez drezi pikoloù [[gwazhienn kas (korfadurezh)|gwazhied kas]], kanolioù [[limf]]atek, hag [[Reizhiad nervennoù tro|elvaj]]. E berr gomzoù ez eo endalc'had kavenn ar brusk pa denner ar skevent.
Rannet eo diwar emglev e :
Kaset e vez da benn an enselladenn hollek a-drugarez d'ar [[skanner]] <!-- et l'[[imagerie par résonance magnétique]] -->.
<!-- [[Image:Médiastin 1.png|400px|thumb|Représentation artistique d'une coupe du médiastin sur la seconde vertèbre thoracique. Planche tirée de "Anatomy of the Human Body" de Gray, publiée en 1918.]] -->
<!-- The '''mediastinum''' is a non-delineated group of structures in the [[thorax]] (chest), surrounded by [[loose connective tissue]]. It is the central compartment of the [[thoracic cavity]]. It contains the [[heart]], the great vessels of the heart, [[esophagus]], [[trachea]], [[thymus]], and [[lymph nodes]] of the central chest. -->
<!-- ==Anatomy==
The mediastinum lies between the right and left [[pleuræ]] in and near the median [[sagittal]] plane of the chest. It extends from the sternum in front to the vertebral column behind, and contains all the thoracic viscera except the [[lungs]]. It may be divided for purposes of description into two parts:
* an upper portion, above the upper level of the pericardium, which is named the ''[[superior mediastinum]]'';
* and a lower portion, below the upper level of the pericardium. This lower portion is again subdivided into three parts, viz.:
** that in front of the pericardium, the ''[[anterior mediastinum]]'';
** that containing the pericardium and its contents, the ''[[middle mediastinum]]'';
** and that behind the pericardium, the ''[[posterior mediastinum]]''.
It is surrounded by the chest wall anteriorly, the lungs laterally and the spine posteriorly. It is continuous with the loose connective tissue of the [[neck]], and extends inferiorly onto the [[diaphragm (anatomy)|diaphragm]].
Note that clinical radiologists and anatomists categorize the mediastinum in slightly different ways.
==Role in disease==
{{main|mediastinal tumor}}
The mediastinum frequently is the site of involvement of various [[mediastinal tumor|tumors]].
[[Mediastinitis]] is [[inflammation]] of the tissues in the mediastinum, usually [[bacteria]]l and due to rupture of organs in the mediastinum. As the infection can progress very quickly, this is a serious condition.
[[Pneumomediastinum]] is the presence of air in the mediastinum, which can lead to [[pneumothorax]], [[pneumoperitoneum]], and [[pneumopericardium]] if left untreated in some cases. However, that does not always happen and sometimes those conditions actually are the cause, not the result, of pneumomediastinum.
These two conditions frequently accompany [[Boerhaave's syndrome]], or spontaneous [[esophageal]] rupture. -->
[[Rummad:Bruched]]
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