Corpus Luteum Cyst

An ovarian cyst that occurs when fluid accumulates inside of the follicle of a mature egg. Normally, the cyst will go away on its own without treatment. However, sometimes the cyst can grow and bleed, which causes abdominal pain and/or pelvic pain. If the cyst fills with blood, it can burst which will cause internal bleeding and sharp pain. ...
Found on http://www.pregnology.com/Pregnancy-dictionary/

Corpus luteum cyst

If the corpus luteum fails to regress at the expected time (around 10 weeks into pregnancy), it turns into a cyst. It rarely presents a problem, but a practitioner will monitor its size as a precaution.
Found on http://www.encyclo.co.uk/local/22139
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