Fig. 5
Ultrasound, MRI and microscopic images of a 58-year-old patient with a small Leydig cell tumor. The right ovarian volume was more than twice that of the opposite side, with the right measuring 3.4 × 1.8 × 2.3 cm (volume 7.0 cm3) and the left measuring 2.3 × 1.1 × 1.0 cm (volume 1.3 cm3). The right ovary had a slightly hypoechoic area (arrowhead) on grayscale ultrasound (a), which was delineated with a relatively rich blood flow signal on Doppler ultrasound (arrowhead, b). Contrast-enhanced MRI in axial view showing a small lesion, which is a slightly hypointense signal in the T1-weighted images (arrow, c), a heterogeneous hyperintense signal in the T2-weighted images (arrow, d), a heterogeneous hyperenhanced signal in the gadolinium-enhanced T1-weighted images (arrow, e), and a partially hyperintense signal in the diffusion weighted images (DWI) (b = 800) (arrow, f)