craniamphitomy

A decompression operation in which the entire circumference of the calvarium is divided. [G. kranion, skull, + amphi, around, + tome, cutting]

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cra·ni·am·phit·o·my (kra″ne-am-fitґə-me) [crani- + amphi- + -tomy] division of the entire circumference of the skull to secure decompression.