In the case of liver cysts or renal cysts, many of which are multiple and benign, small cysts can be followed up and do not require surgery. If the cysts enlarge significantly, have pressure symptoms, or cause pain, tenderness, and abnormalities in liver or kidney function, surgery may be considered, and usually an open drainage of the cysts can be performed. If it is a thyroid cyst, usually thyroid adenoma or nodular goiter, formed after cystic degeneration, the thyroid nodule may suddenly increase in size, and the patient will have neck pain, swelling, and a sense of compression. Therefore, surgical resection is needed. After the resection, intraoperative freezing examination should be sent to know the benign or malignant nature of the mass, and lymph node dissection may be needed if malignant nodule is suspected.