There is no scientific evidence that spermatogonia is not easy to metastasize, spermatogonia is a malignant tumor occurring in testis, which is metastatic; it can be metastasized through lymphatic channels or blood. Spermatogonial cell tumor can be manifested as a single painless mass in the scrotum, with the gradual increase of the tumor, the testicle can be hard and heavy, accompanied by dull pain and swelling sensation, which may or may not be accompanied by obvious metastatic symptoms; delayed treatment can spread to all parts of the body, and the prognosis is relatively poor; through early discovery, early diagnosis, and early treatment, most of the patients’ prognosis is good. After tumor metastasis occurs, there can be tumor compression of surrounding organs, which often manifests as chest pain, cough, dyspnea, fever, or weight loss, etc.; it can be metastasized to organs such as bone, lung, liver, spleen, spine or brain. It is recommended to go to the hospital for timely consultation and examination and early treatment when finding seminomas.