Equine paranasal sinusitis

Veterinary advice should be sought before applying any treatment or vaccine.

Equine Paranasal Sinusitis

Sinusitis, Equine Paranasal Sinus Disease

Equine paranasal sinusitis is an infection of the horse's perinasal sinus cavities. Horses have 7 bilaterally paired sinuses that all drain into the nasal cavity through an opening into the nasal passage.


Unilateral or bilateral, malodorous to purulent nasal discharge
Facial swelling or asymmetry
Increased respiratory rate
Difficulty or abnormal breathing


  • History
  • Clinical signs
  • Physical exam
  • Radiography
  • Computed tomography
  • Sinoscopy
  • Endoscopy
  • Computed tomography (CT)
  • MRI



Identification and effective treatment of underlying or predisposed causes
Repeated lavage of the sinus with balanced polyionic solution
Standing sinus flap surgeryA common surgical procedure that equine surgeons perform on sedated standing horses.
Sinoscopic surgery
Balloon sinuplasty
Transnasal laser sinonasal fenestration


Scientific Research

General Overviews

Risk Factors

  • Dental disease of the third to sixth maxillary cheek teeth
  • History of recent upper respiratory tract infection
  • nasal epidermal inclusion cysts
  • Ethmoid hematoma
  • Fungal granuloma
  • Fracture of facial bones
  • Neoplasia
  • Primary infection of a rostral maxillary cheek root infection
  • Sinonasal polyps
  • Prior trauma to nasal area
  • Progressive ethmoidal hematoma