A corpus luteal cyst develops due to the growth, instead of the normal regression, of the corpus luteum. These cysts will appear very similar to a tubal ectopic pregnancy.
How can you tell the difference between the two?
| Tubal Ectopic Pregnancy | Corpus Luteal Cyst |
| May find yolk sac or fetal pole | |
| Will move independent of the ovary in response to transducer manipulation | Will move with the ovary in response to transducer manipulation |
| Tubal ring is more echogenic | Tubal ring is less echogenic |
| Tubal ring is thicker | Tubal ring is thinner |
| Cystic fluid is more likely to be “clumpy” or have some echoes | Cystic fluid is more likely to be clear and anechoic |
| May have ring of fire sign | May have ring of fire sign |
