Thoracostenosis is best described as?

Thoracostenosis refers specifically to an abnormal contraction or narrowing of the chest wall. This condition can lead to structural changes that affect the thoracic cavity, ultimately impacting lung function and ventilation. The description of abnormal contraction highlights how the physical structure of the chest can change, which may ultimately lead to complications in breathing and other respiratory issues. Other choices relate to different medical conditions and processes unrelated to the structural changes in the chest wall, such as inflammation of the lung or breathing difficulties, which can be symptoms but do not define thoracostenosis itself. Therefore, the focus on the contraction of the chest wall makes this choice the most accurate representation of the term.