Mirror image artifact creates a duplicate of a real structure on the far side of a strong specular reflector, most commonly the diaphragm. Sound reflecting off the liver–diaphragm interface bounces back into the liver, reflects off an internal structure, and returns to the transducer via the diaphragm again — the machine interprets this longer path as a deeper structure. The result is a mirror image of the liver or a hepatic mass appearing to float above the diaphragm in the chest.