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Archive Case #230: Avian Air Sacculitis

Bird veterinary case - Medium - October 19, 2026

Clinical Clues

  1. A pet parrot becomes quieter and less willing to fly over several days.
  2. Breathing effort increases with activity, but there is no prominent nasal discharge or sneezing.
  3. Radiographs show abnormal opacity around the normally translucent air sacs; the image alone cannot identify a cause.
  4. Coelomic endoscopy shows cloudy, thickened air-sac membranes with inflammatory material on their surfaces.
  5. A sample from the affected membranes confirms inflammation centred in the air sacs, without establishing a particular organism.
  6. The supported anatomical diagnosis is avian air sacculitis: inflammation of the air sacs, with its cause still undetermined.

Diagnosis

Avian Air Sacculitis

Direct examination and sampling localise inflammation to the air sacs, supporting avian air sacculitis. Aspergillosis can cause this lesion, but neither the appearance nor respiratory signs establish a fungal cause; upper-airway disease alone would not explain the sampled air-sac inflammation. Remember: Air sacculitis names the inflamed site, not its cause; investigate the affected tissue before calling it fungal, bacterial or another specific disease.

Learning review

Review the case evidence

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

Evidence checkpoints

Clues 1-2

  1. Clue 1: A pet parrot becomes quieter and less willing to fly over several days.
  2. Clue 2: Breathing effort increases with activity, but there is no prominent nasal discharge or sneezing.

Clues 3-4

  1. Clue 3: Radiographs show abnormal opacity around the normally translucent air sacs; the image alone cannot identify a cause.
  2. Clue 4: Coelomic endoscopy shows cloudy, thickened air-sac membranes with inflammatory material on their surfaces.

Clues 5-6

  1. Clue 5: A sample from the affected membranes confirms inflammation centred in the air sacs, without establishing a particular organism.
  2. Clue 6: The supported anatomical diagnosis is avian air sacculitis: inflammation of the air sacs, with its cause still undetermined.

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 Air Sacculitis?
  3. How do clues 5-6 align with the case explanation for Avian Air Sacculitis?

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.