Dermoid cysts are one of the more interesting types of ovarian cysts. In a dermoid cyst, the unfertilized egg will actually start to form into human structures. This will make a cyst that contains teeth or hair or bone. These type of cysts do have to be surgically removed, but they are not cancerous.
Here’s an x-ray from the radiology picture of the day:
You can see it down in the pelvis – I’m guessing this cyst contained teeth!
If you want to see some more graphic pictures of dermoid cysts, you can find some dermoid ovarian cyst pictures here.