pneu·mo·tho·rax /ˌnuməˈθorˌæks, ˌnju, ˈθɔr-/
  pneu·mo·tho·rax /ˌn(j)uməˈθo(ə)rˌæks, ˈθɔ(ə)r-/ 名詞
  Pneu·mo·tho·rax n.  Med. A condition in which air or other gas is present in the cavity of the chest; -- called also pneumatothorax.
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  pneumothorax
       n : abnormal presence of air in the pleural cavity resulting in
           the collapse of the lung; may be spontaneous (due to
           injury to the chest) or induced (as a treatment for
           tuberculosis)