Can you help me interpret this ultrasound's results?

[ktknaz]

Can you tell me what it means to have a 2.1 seen rounded anechoic unilocular structure in my left overy, as well as free fluid in the pelvic cavity? Could you also tell me whether any of this could be causeing some pain in my left ovary?
Here is what it says:
"The uterus is anteverted and normal in size and appearance.  It measures 8.6 x 2.8 x 4.5 cm.  The emdometrium is normal in thickeness, measuring 10mm.  There is 2.1 seen rounded anechoic unilocular structure within the left ovary suggestive for a dominant follicle.  The right ovary is normal.
The urinary bladder is well-distended.  It is unremarkable.  There is a trace of free fluid in the pelvic cavity."

I am 17 and have irregular periods, that come less than 6 times a year. I have had my period for 4 years and my first 3 were exactly 28 days appart but since them they vary very much.
Thank you very much!

[AnnieBrooke]

Coincidentally, I had to have an ultrasound today, and when I was there, I asked the sonographer what "anechoic" meant.  Turns out that I guessed wrong, anechoic means fluid filled, and I was guessing it was not fluid filled.  If you have a lobe in your ovary that is fluid filled, especially if it was suggestive of a dominant follicle, that is a pretty standard description (can't think of a better way to describe it in fact) of an ovarian cyst.  I've had maybe ten ovarian cysts in my life, and they can hurt like crazy before they finally drain.   But being painful doesn't make them very serious.  Maybe that is why your doctor didn't react very strongly.  

[ktknaz]

My doctor looked at the report, saw the bottom where it was written that the ultrasound was "within normal limits" and told me that everything was fine.  I don't think he even read it...let's just say he is not the brightest bulb in the tanning bed so I'm not surprised.

[AnnieBrooke]

I cannot say for sure, but it sounds like they are saying that you have something with only one "lobe" and not fluid in your ovary, that might be an egg follicle.  Anechoic just means it doesn't echo with the sound waves of an ultrasound.  If it is just a follicle and has not been there for a while, it could simply be the usual thing that happens every month, when one egg gets ready to pop out with ovulation.  But if it has been there a while, maybe it's more like a solid cyst.  If it has been there for a while, it could give you pain in your ovary.  How did you have this much medical information without a doctor telling you what it means?  Usually they have you talk to the doc after the ultrasound.  If that didn't happen, call the doctor!  My suggestion any time you suspect an ovarian cyst is to get another ultrasound in a month or two months, and see if it has changed.  See if this is what your doctor says.