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Rovsing's sign
Rovsing's sign, named after the Danish surgeon Niels Thorkild Rovsing (1862 -1927),〔(Rovsing's sign. )〕 is a sign of appendicitis. If palpation of the left lower quadrant of a person's abdomen increases the pain felt in the right lower quadrant, the patient is said to have a positive Rovsing's sign and may have appendicitis.
In acute appendicitis, palpation in the left iliac fossa may produce pain in the right iliac fossa.
== Referral of pain ==
This anomaly occurs because the pain nerves deep in the intestines do not localize well to an exact spot on the abdominal wall, unlike pain nerves in muscles. Pain from a stomach ulcer or gallstone can be interpreted by the brain as pain from the stomach, liver, gall bladder, duodenum, or first part of the small intestine. It will "refer" pain often to the mid upper abdomen.
Because the appendix is a piece of intestine, it follows a similar referral pattern. An appendix with some early inflammation may give a non-specific irritation somewhere near the umbilicus (belly button). Should the inflammation become severe, it may actually irritate the inner lining of the abdominal cavity called the peritoneum. This thin layer lies under or behind the abdominal wall muscles. Now the pain is "localized". If pressure is applied to the muscles of the right lower abdomen (or iliac fossa) near a very irritated appendix, then the muscle fibers in that area will be stretched and will hurt.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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