p. hernia — anomalous development of the diaphragm and pleuropericardial membranes that allows herniation of variable amounts of abdominal contents into the pericardial sac. May cause dyspnea, tachypnea, vomiting, diarrhea, cardiac tamponade and congestive heart failure, but some cases are only detected incidentally at postmortem examination. Seen in dogs and cats.
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