DailyDx: What is the Diagnosis of this Hyperemia Uterus?

What could be the cause of this degree of hyperemia of the uterus?

There is also a small endometrial polyp seen here.
What's your diagnosis?  Add your answer below, then check the diagnosis.

The diagnosis of this hyperemia uterus is: a small endometrial polyp with pelvic inflammatory disease

Differential diagnosis:  Endometritis

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