Fig. 7.

Immature teratoma, prepubertal-type. A 31-day-old boy with a painless left scrotal mass. a Ultrasound shows a heterogeneous predominantly solid mass (arrows) replacing the testis except a peripheral rim (arrowheads). b Colour Doppler demonstrates vascularization in the solid components of the mass. Hydrocele (star). Radical inguinal orchiectomy is practised. c Microscopic exam shows stromal, neural, cartilage and digestive immature cells