Interesting case this... Transabdominal ultrasound images of suspected early pregnancy (urine pregtest positive) with pain in pelvis, showed a prominent cystic lesion at the upper border of the cervix. The cyst measured 11mm. and was located just beneath the serosa. I was not sure if this was a a cervical ectopic gestation. The lesion appeared separate from the left ovary.
Transvaginal ultrasound images and Color Doppler imaging , revealed the presence of intrauterine gestation sac of 4.5 mm. Color Doppler image showed absence of "ring of fire" around the cyst, confirming its benign nature. The final diagnosis in this case - early gestation sac with Nabothian cyst of cervix.
See: http://www.ultrasound-images.com/early-pregnancy.htm for more such intriguing ultrasound images of early pregnancy.
Also visit: http://www.ultrasound-images.com/uterus.htm#Nabothian_cysts_of_the_cervix
(Discussion and images of multiple Nabothian cysts of cervix)