"card-" is the root word for pericardiectomy. "peri-" means
around, and "ectomy" means surgical removal. A pericardiectomy is
the surgical removal of the sac around the heart.
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That would be "cardium". The root word is cardium meaning heart. Then Peri- for around, and -ectomy for removal have been added. So a pericardectomy is the surgical removal of the sac around the heart.
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Removal of all or part of the pericardium (pericardiectomy) may
be necessary.