Without knowing too much about the case, I%26#039;m guessing an ultrasound showed you have a cyst, and you%26#039;re worried it%26#039;s cancerous? Well, something like 99% of ovarian cysts are not cancerous. They%26#039;re VERY common and generally harmless. There are certain characteristic appearances that cancers have (irregularity, metastases, multiple septations, solidity, etc.). So you can look at something and get an idea that it might be cancerous if it has certain features. If it lacks those features, and just looks like a regular cyst, then it%26#039;s almost certainly not cancerous. But, yes, it%26#039;s always possible that it could be cancerous. It%26#039;s just that the chances are extremely low, so it%26#039;s not something you should worry about unless there%26#039;s a medical history that would indicate worry.