Which term can be used interchangeably with simple cyst?

The term that can be used interchangeably with simple cyst is "functional cyst." Functional cysts are a common type of ovarian cyst that develop as part of the normal menstrual cycle. They are typically filled with clear fluid and are usually benign. Simple cysts are characterized by their smooth walls and lack of solid components or septations, which aligns with the definition of functional cysts.

While the term "ovarian cyst" may seem fitting, it is broader and encompasses various types of cysts, including both functional cysts and other types like complex or dermoid cysts, rather than being specific to simple cysts. A "complex cyst," by definition, contains solid components, septations, or both, and therefore does not equate to a simple cyst. A "dermoid cyst," also known as a teratoma, contains tissues such as hair, fat, and sometimes teeth, and is a different entity altogether. Hence, the specific terminology of "functional cyst" accurately reflects its relationship as interchangeable with a simple cyst.