A hernia or protrusion of brain tissue through a defect in the skull, creating an abnormal bulge.
From Greek 'kranion' (skull) + 'kele' (hernia/rupture). The term combines the medical prefix for skull with the suffix indicating a cavity or protruding sac that developed in medical terminology during the 19th century.
This rare condition shows how ancient Greek anatomy words still help doctors describe what happens when the protective skull barrier fails—it's like a biological safety system with a critical design flaw.
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