What is the difference between protrusion and extrusion?
What is the difference between obtrusion and intrusion?
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A protrusion exists when only a few cartilage rings are torn and there is no actual leakage of the center material; the disc protrusion looks like a "bump". With an extrusion, all the cartilage rings have torn in a small area, allowing the jelly-like material to flow out of the disc.
To be intrusive is to involve oneself into the affairs of others, generally in an objectionable manner, tactlessly but not necessarily in a way that calls attention to oneself. To be obtrusive, by contrast, is to interfere without regard for propriety or subtlety.
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