Definition of mediastinum in English:

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Pronunciation: /ˌmiːdɪəˈstʌɪnəm/

noun (plural mediastina /ˌmiːdɪəˈstʌɪnə/)

A membranous partition between two body cavities or two parts of an organ, especially that between the lungs.
Example sentences
  • The tumor, which is often but not always associated with cystic lung lesions, may arise in pulmonary parenchyma, the mediastinum, and pleura.
  • On the lateral radiograph there appeared to be herniation of the left lung through the anterior mediastinum.
  • The left main bronchus was exposed at the posterior mediastinum and separated from connective tissue.



Pronunciation: /ˌmiːdɪəsˈtʌɪn(ə)l/
Example sentences
  • One patient had extensive cervical, posterior mediastinal, and abdominal lymphadenopathy.
  • Two patients presented with masses in the upper lobe of the right lung, simulating posterior mediastinal tumors.
  • All men with mediastinal lung masses require a careful testicular examination.


Late Middle English: neuter of medieval Latin mediastinus 'medial', based on Latin medius 'middle'.

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