Ruptured corpus luteum cyst
Sudden onset abdominal pain. Diffuse tenderness and guarding. Pregnancy test negative. Ultrasound showed right adnexal mass and free fluid. CT to evaluate for malignancy.
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There is a large volume of high density fluid throughout the abdomen in keeping with a haemoperitoneum. There is a mixed density 5 cm "mass" in the region of the right ovary. This is surrounded by a large volume of high density fluid in keeping with a possible sentinel clot.
The differential of a spontaneous haemoperitoneum in a young female is between ruptured corpus luteum cyst or ruptured ectopic pregnancy, with the beta HCG test being an important differentiator as they can look identical on imaging studies. At surgery, a ruptured corpus luteum cyst was confirmed.
Clinical history: Bleeding right ovarian cyst. Right salpingo-oophorectomy.
Macroscopic description: Right ovary and Fallopian tube. Ovary 49x35x12mm and contains ruptured cystic area 25x20mm. Attached Fallopian tube 50x5x5mm
Microscopic description: The ovary contains an enlarged, degenerate corpus luteum, amounting to a luteal cyst. The background ovary and Fallopian tube are unremarkable.
Conclusion: Right ovary and Fallopian tube - luteal cyst