Can malignancy in an ovarian cyst be detected via ultrasound?

I received my results from a pelvic (transabdominal & endovaginal) ultrasound. In the conclusion, the doctor stated "Complex mass in the left ovary measuring 3 cm. This contains cystic and solid components. The differential includes benign and malignant lesions." My question is, since I know that ultrasound can be very very detailed now, is it truly possible that the doctor was able to tell that the mass is at least partially malignant, or was that an "irresponsible" or incorrect way to phrase it because you cannot tell for FACT if a mass has malignancy by ultrasound alone? If he stated malignant, does that in fact mean that he likely spotted an area that shows signs of definite malignancy? I do have a follow up appt. with a OBGYN/ONC, however they can't get me in for over a week, and of course its making me nuts. If in fact it is likely malignant, fine, I'd just like to know. Not knowing is maddening! Thank you for your help...