It would need a sonologist to opine on the findings and it is difficult to say without even having a look at the pictures. It could be due to some calcified spot or mass and the exact cause can be noted only by clinical correlation. This could also be the cause of your pelvic pain
. It could be a functional ovarian cyst
or a dermoid cyst
with calcified spots. Please get further suggestions from your doctor and please remember, treatment is available for either condition and there is absolutely no need to worry. Take care.