Fig. 4
From: Testicular tumours in children: an approach to diagnosis and management with pathologic correlation
Yolk sac tumour. a A 14-month-old boy with a painless right scrotal mass. b Ultrasound shows an intratesticular hypoechoic mass (arrows) with a rim of healthy tissue preserved (arrowheads). c Power Doppler reveals abnormally abundant blood flow within the tumour. d Axial diffusion-weighted MRI shows the mass with hyperintensity (arrow). e ADC map shows a low signal intensity from diffusion restriction of the mass (arrow). The boy has a very high level of alphaphetoprotein and inguinal orchiectomy is practised. f Surgical piece includes inguinal cord. g Microscopic exam shows a microcystic yolk sac tumour containing glands and tubular structures with subnuclear vacuoles.