Final answer:
An abnormal or displaced space resembling a cyst is referred to as a pseudocyst, which is different from an abscess, hematoma, or an echinococcal cyst.
Step-by-step explanation:
An abnormal or displaced space resembling a cyst but not actually a true cyst is called a pseudocyst. This is a fluid-filled structure that often arises in the pancreas or other organs but is not lined by the epithelium like a true cyst. The term abscess refers to a pus-filled cavity caused by an infection, a hematoma is a collection of blood outside of blood vessels, and an echinococcal cyst is associated with hydatid disease or cystic echinococcosis caused by the parasite Echinococcus granulosus.