What is same sided shifting dullness?

 Same sided shifting dullness is very difficult to demonstrate.
This is used for clinical detection of small amount of free fluid
How to elicit same sided shifting dullness?

• During the examination by conventional method of shifting dullness, turn the patient to the side of flank percussion and not to the opposite side.
•  Now percuss the flank with difficulty which gives a dull note (here. flanks are originally resonant in supine position due to small collection of free fluid).