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Vetdle Archive

Archive Case #53: Equine Pituitary Pars Intermedia Dysfunction

Horse veterinary case - Medium - April 25, 2026

Clinical Clues

  1. An older pony is presented for a long shaggy coat that has not shed normally this season.
  2. The owner also reports increased drinking and a history of repeated hoof soreness.
  3. On examination there is regional adiposity and a curly hair coat.
  4. The pony has had more than one previous laminitic episode.
  5. Endocrine testing supports a chronic age-associated hormonal disorder.
  6. Pituitary pars intermedia dysfunction commonly causes hypertrichosis, laminitis, and metabolic change in older horses.

Diagnosis

Equine Pituitary Pars Intermedia Dysfunction

This case is most consistent with Equine Pituitary Pars Intermedia Dysfunction because the older pony has abnormal coat retention, recurrent laminitis, and supportive endocrine testing. The most important clues are the hypertrichosis and age-related endocrine pattern, which make a simple seasonal coat problem unlikely.

Learning review

Review the case evidence

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

Evidence checkpoints

Clues 1-2

  1. Clue 1: An older pony is presented for a long shaggy coat that has not shed normally this season.
  2. Clue 2: The owner also reports increased drinking and a history of repeated hoof soreness.

Clues 3-4

  1. Clue 3: On examination there is regional adiposity and a curly hair coat.
  2. Clue 4: The pony has had more than one previous laminitic episode.

Clues 5-6

  1. Clue 5: Endocrine testing supports a chronic age-associated hormonal disorder.
  2. Clue 6: Pituitary pars intermedia dysfunction commonly causes hypertrichosis, laminitis, and metabolic change in older horses.

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 Pituitary Pars Intermedia Dysfunction?
  3. How do clues 5-6 align with the case explanation for Equine Pituitary Pars Intermedia Dysfunction?

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.