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Vetdle Archive

Archive Case #135: Equine Endometritis

Horse veterinary case - Medium - July 16, 2026

Clinical Clues

  1. A broodmare is investigated after failing to conceive over multiple breeding cycles.
  2. The owner reports a small amount of vulvar discharge after covering.
  3. Ultrasound identifies fluid retained within the uterus.
  4. The mare otherwise appears healthy and cycles normally.
  5. Endometrial cytology and culture support uterine inflammation and infection.
  6. Inflammatory disease of the equine uterus is a common cause of subfertility in mares.

Diagnosis

Equine Endometritis

This case is most consistent with Equine Endometritis because the mare has repeat breeding failure with uterine fluid and supportive reproductive diagnostics. The most important clues are the infertility history and intrauterine fluid, which make an ovulation problem less likely.

Learning review

Review the case evidence

Use the paired clues to explain how the evidence in this horse case supports the provided diagnosis, Equine Endometritis, then compare your reasoning with the case explanation.

Evidence checkpoints

Clues 1-2

  1. Clue 1: A broodmare is investigated after failing to conceive over multiple breeding cycles.
  2. Clue 2: The owner reports a small amount of vulvar discharge after covering.

Clues 3-4

  1. Clue 3: Ultrasound identifies fluid retained within the uterus.
  2. Clue 4: The mare otherwise appears healthy and cycles normally.

Clues 5-6

  1. Clue 5: Endometrial cytology and culture support uterine inflammation and infection.
  2. Clue 6: Inflammatory disease of the equine uterus is a common cause of subfertility in mares.

Self-review prompts

  1. After clues 1-2, what evidence from this horse case shaped your initial interpretation?
  2. When you compare clues 3-4 with clues 1-2, what changed in your reasoning about Equine Endometritis?
  3. How do clues 5-6 align with the case explanation for Equine Endometritis?

Educational Use

Vetdle archive cases are educational veterinary games for diagnostic reasoning practice. They do not provide veterinary advice, diagnosis, treatment, or professional medical guidance.