In a severe case of sinusitis in an equine patient, what is the term used to describe the surgical creation of a hole into the sinus to allow the drainage of pus?
  1. Trephination
  2. Boreing
  3. Tenonectomy
  4. Siphon
Explanation
Answer: A - Trephination is the surgical act of creating a hole into the sinus to allow drainage of pus. A trephine is used and the sinus is flushed heavily with the patient placed on antibiotics.
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