During trauma assessment of the abdomen, "Ballance's sign" may be observed upon exam.
Ballance's sign is dullness to percussion in the left flank LUQ and shifting dullness to percussion in the right flank seen with splenic

Spleen

The spleen is an organ found in virtually all vertebrate animals with important roles in regard to red blood cells and the immune system. In humans, it is located in the left upper quadrant of the abdomen. It removes old red blood cells and holds a reserve of blood in case of hemorrhagic shock...

 rupture/hematoma

Hematoma

A hematoma, or haematoma, is a localized collection of blood outside the blood vessels, usually in liquid form within the tissue. This distinguishes it from an ecchymosis, which is the spread of blood under the skin in a thin layer, commonly called a bruise...

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The dullness in the left flank is due to coagulated blood, the shifting dullness on the right due to fluid blood.

It is named for Charles Alfred Ballance

Charles Alfred Ballance

Charles Alfred Ballance was an English surgeon who specialized in the fields of otology and neurotology. For much of his professional life he was associated with St. Thomas' Hospital and National Hospital, Queen Square in London...

, an English surgeon, 1856-1936.