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Archive Case #139: Avian Egg Yolk Peritonitis

Bird veterinary case - Medium - July 20, 2026

Clinical Clues

  1. A laying pet bird is presented for depression, abdominal distension, and reduced appetite.
  2. The owner says egg production has become irregular and the bird now sits fluffed up on the cage floor.
  3. The coelom feels distended and the bird adopts a wide-based stance.
  4. Imaging identifies free coelomic fluid without a retained shelled egg.
  5. The fluid is consistent with inflammatory material associated with reproductive leakage.
  6. Egg material released into the coelom can trigger severe sterile or septic peritonitis in birds.

Diagnosis

Avian Egg Yolk Peritonitis

This case is most consistent with Avian Egg Yolk Peritonitis because the laying bird has coelomic distension, reduced laying, and inflammatory fluid without a retained egg. The most important clues are the reproductive history and coelomic fluid pattern, which make simple egg binding less likely.

Learning review

Review the case evidence

Use the paired clues to explain how the evidence in this bird case supports the provided diagnosis, Avian Egg Yolk Peritonitis, then compare your reasoning with the case explanation.

Evidence checkpoints

Clues 1-2

  1. Clue 1: A laying pet bird is presented for depression, abdominal distension, and reduced appetite.
  2. Clue 2: The owner says egg production has become irregular and the bird now sits fluffed up on the cage floor.

Clues 3-4

  1. Clue 3: The coelom feels distended and the bird adopts a wide-based stance.
  2. Clue 4: Imaging identifies free coelomic fluid without a retained shelled egg.

Clues 5-6

  1. Clue 5: The fluid is consistent with inflammatory material associated with reproductive leakage.
  2. Clue 6: Egg material released into the coelom can trigger severe sterile or septic peritonitis in birds.

Self-review prompts

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

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.