Fig. 2

Ultrasound images supporting the difference in results between the groups. a. Image of a pathologically proven adult granulosa cell tumor from a patient (case 172 among the 599 women) is shown. This was a smooth solid mass with a color score of 2–3. Both senior and junior doctors classified the mass as O-RADS 4. But Senior doctors subjectively diagnosed it as malignant, while junior doctors subjectively diagnosed it as benign. b. Image of a pathologically proven mucinous cystadenoma from a patient (case 204 among the 599 women) is shown. This was a multilocular cyst with solid component, and with a color score of 3–4. Senior doctors classified the mass as O-RADS 5, and junior doctors classified it as O-RADS 4. Both senior and junior doctors diagnosed the mass as malignant by subjective judgment