in pyopneumothorax, hydropneumothorax, and some cases of injury, the diaphragm on the affected side rises during inspiration and falls during expiration.
par·a·dox·ic di·a·phragm phe·nom·e·non
(par'ă-doks'ik dī'ă-fram fĕ-nom'ĕ-non) In pyopneumothorax, hydropneumothorax, and some cases of injury, the diaphragm on the affected side rises during inspiration and falls during expiration.