Mixed nonseminomatous germ cell tumor that manifested as a cystic lesion in a 36-year-old man who presented with testicular enlargement and pain of 2 months duration. Sagittal US scan of the right testicle shows multiple cystic regions surrounded by a rim of hyperechoic testicular parenchyma distinct from the normal testicular parenchyma. Color and duplex Doppler US did not show any blood flow in the cystic areas but did show flow in the tumor stroma surrounding these cystic areas. The patient underwent orchiectomy, which confirmed the diagnosis.

http://radiographics.rsna.org/content/21/suppl_1/S273.figures-only