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The human abdomen is divided into quadrants by doctors to localise pain and tenderness, scars, lumps and other items of interest. The quadrants are referred to as the left lower quadrant, left upper quadrant, right upper quadrant and right lower quadrant.
The term is not used in comparative anatomy, since most other animals do not stand erect. The equivalent term for animals is left posterior quadrant.
The equivalent term for animals is 'left anterior quadrant'.
The equivalent term for animals is 'right anterior quadrant'.
The equivalent term for animals is 'right posterior quadrant'.
In the LLQ if abdominal pain or signs of peritonitis are localised, colitis, diverticulitis, ureteral colic or pain due to ovarian cysts or pelvic inflammatory disease, may be suspected. Examples of tumours in the left lower quadrant include colon cancer or ovarian tumour.
The RLQ may be painful and/or tender in such conditions as appendicitis.