The cystic echogenicity seen on ultrasound is what is clinically referred to as a cyst. Cysts can occur in any part of the tissue or organ. More common in clinical practice are liver cysts, kidney cysts, and cysts of the thyroid, breast, and ovaries. Cysts of the liver and kidneys are usually associated with degenerative changes. Cysts of the thyroid and breast are associated with work and stress. In contrast, ovarian cysts are partly physiological and can disappear on their own after some time. Most cysts have no functional impact on the organ itself, and most of them are benign and do not require clinical intervention, only regular observation. In general, when describing cysts, ultrasound should describe whether the borders of cysts are smooth and neat, and the shape of cysts is usually round or oval and relatively regular, and also describe the internal echogenicity of cysts, for example, many simple cysts have good transmission, but of course some cysts have poor internal transmission. Most of the cysts with good translucency have enhanced posterior echogenicity and lateral acoustic shadow. The ultrasonographer has to make a preliminary determination of the cyst based on the sonographic features of the cyst as described clinically.