Cystic echogenicity is the technical term of ultrasound, which refers to the cystic occupying lesion in the tissue that can return echoes specific to cystic tissue after ultrasound examination, called cystic echogenicity, the tissue is characterized by fluid with wall, such as liver cyst, kidney cyst, adnexal cyst, the vast majority of them are benign lesions, and very few of them can be malignant. Cysts are tumors, not solid masses. Tumor cells are in the inner wall and have secretory characteristics, which can secrete fluid. The secreted fluid enters the middle of the cystic cavity and is wrapped by the cystic cavity, that is, it forms walled fluid.