Epididymal tumor is a general term for all kinds of tumors that occur in and around the epididymis, which is relatively rare. It is recommended to consult doctor for diagnosis and treatment as soon as possible. Epididymal tumor is extremely rare, its cause is not yet studied clearly, and may be related to many factors (such as heredity, long-term exposure to carcinogenic substances, etc.). The main clinical manifestation is enlargement of epididymis, the skin may be smooth in early stage and uneven and nodular in late stage. In addition, most of the patients will also have high fever, nausea, vomiting and other systemic symptoms. For benign epididymal tumor, simple tumor resection or epididymectomy of the affected side can be chosen for treatment. If it is malignant, testicular epididymectomy with high cut of spermatic cord is needed. In general, benign epididymal tumors have a better prognosis. While malignant epididymal tumors have different prognosis depending on the metastasis degree, patient’s physical quality, surgical treatment effect and other factors.