Seminoma

Germ Cell Tumor Descriptors

Seminoma - Homogeneous - Hypoechoic Embryonal Cell CA - Hypoechoic - Increasedechogenicity and cystic areas (hemorrhage/ necrosis) Teratoma - Complex-Heterogeneous Choriocarcinoma - Complex - Hemorrhage - Necrosis Calcifications Yolk Sac Tumor Seminoma. The is the most common single type of primary testicular tumor (35-70%) and the most common tumor found in patients with undescended testis. The peak age of occurrence is 30-40 years of age. The serum alpha fetoprotein is usually normal and the beta HCG elevation is present in 10-15% of the cases. On ultrasound the seminomas tend to appear more homogeneous and hypoechoic than other germ cell tumors until they become large, at which point they become heterogeneous. They are usually confined within the tunica albuginea. These tumors are very sensitive to radiation and chemotherapy. The survival rate is high at 75-85%.