This is an easy case, but I wanted to share the beautiful picture above, and the diagnosis is a crucial one to make.
A 20 year old woman presents with abdominal pain, breast tenderness, frequent urination, nausea, and shoulder pain. Her LMP was 8 weeks ago, but she's noted some vaginal bleeding. She has a history of pelvic inflammatory disease. Her sexual debut was at age 16. She has no surgical history.
Challenge: A pathologic image of this disease is shown above. What is it?
Image is in the public domain.