Can an enlarged ovary be cancer?

Many causes. There can be ovarian cysts, benign growths or tumors, cancerous tumors. An ultrasound and evaluation by a gynecologist or gynecologic oncologist can help distinguish the cause of enlargement. Often it is not a cause of worry unless one is postmenopausal, then it can be more worrisome. I have shared this with gyn subspecialists for more detailed information in comments or answers.
Possibly. There are many reasons for enlarged ovaries, commonly cysts. Other conditions, both benign and cancerous can cause enlarged ovaries.

Related Questions

Confused and getting conflicting answers. Can ovary enlarge due to ovarian cancer without a mass?

Certainly. An ovary can certainly enlarge due to cancer, but it may not be a palpable mass. This is why even if you have had a hysterectomy, you still need a physical every year. The average womans ovaries are not palpable, particularly if they are even mildly overweight. If your doctor feels an ovary, that is a suspicious finding, particularly in post menopausal women. Read more...
Not likely. There are no easy ways to make a diagnosis of early ovarian cancer. Majority of ovarian cancers are complex cystic. Homogenous bilateral ovarian enlargement without other findings is probably not due to cancer. Read more...