Adrenal cysts are rare cystic masses produced by the adrenal glands. It is generally non-functional and asymptomatic, with a diameter of less than 10 cm when accidentally discovered. However, a giant adrenal cyst refers to an adrenal cyst with a diameter greater than 10 cm. They pose diagnostic difficulties for surgeons because it is very difficult to locate the origin of the cyst. Indications for surgical intervention include diameters greater than 10 cm, presence of symptoms, endocrine abnormalities, intracapsular hemorrhage, and suspected malignancy. The evaluation criteria for adrenal cysts include a wide range of differential diagnosis, making it difficult to confirm the diagnosis and subsequent treatment. These cysts can be divided into four subtypes: endothelial, pseudocyst, epithelial and parasitic.