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Equine Practice
Endoscopic examination of the equine paranasal sinuses
  1. Cedric Chan

    Cedric Chan qualified from Bristol in 1989. He recently completed a residency in equine surgery at Glasgow and holds the RCVS certificate in equine orthopaedics.

  2. Graham Munroe

    Graham Munroe qualified with honours from Bristol in 1979. In 1994 he was appointed senior lecturer in large animal surgery at Edinburgh. He holds the RCVS certificate in equine orthopaedics, the diploma in equine stud medicine, the diploma of fellowship and a PhD from Glasgow.


THE majority of horses which present with a unilateral nasal discharge will have a disorder of the paranasal sinuses. The history and results of a physical clinical examination are often insufficient for providing a definitive diagnosis of the cause of sinusitis and further evaluation is therefore necessary. At present, radiography, nasal endoscopy and sinocentesis are the most commonly used diagnostic techniques. Recently, the use of direct endoscopic examination of the paranasal sinuses or ‘sinuscopy’ has become a useful adjunct in the evaluation of equine sinus disorders. This article discusses the technique of sinuscopy, using either an arthroscope or flexible endoscope, as well as describing the normal sinus structures and sampling/postoperative options.

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