Fig. 3

Difference in ultrasound features between struma ovarii and ovarian dermoid cyst. a Predominantly cystic struma ovarii typically mimicking an epithelial ovarian tumour (either cystadenoma or borderline ovarian tumour) in the right ovary of a 51-year-old patient presenting with non-specific abdominal cramps. Some thicker septations are seen (arrow) between otherwise cystic areas presenting with anechoic fluid and posterior acoustic enhancement (A).Right 1.5-cm (b) and left (c) 5.1-cm dermoid cyst in a 24-year-old woman. Both lesions on ultrasound have the typical pattern of high attenuation within the cyst (arrows) representing its fatty component