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=='''Sinusitis'''==
*Often undetected unless it causes facial deformity or a draining tract onto the skin
*Seromucous sinuitis in not significant, often an extension of viral infection in [[Nasal cavity - inflammatory#Rhinitis|nasal cavity]]
*Purulent sinusitis tends to obstruct drainage -> chronic purulent sinusitis
*Most important in horses due to their complex sinuses
*'''Primary''':
**Young horses are more prone as they are susceptible to [[Respiratory Bacterial Infections - Pathology#Strangles|Strangles]]
**Following transient systemic [[Streptococci|''Streptococcus'']] infection
**Rarely [[Respiratory Fungal Infections - Pathology#In Horses|fungal infections]]
*'''Secondary''':
**Most common sequel to [[Nasal cavity - inflammatory#Rhinitis|rhinitis]]
**Dental or periodontal disease (maxillary sinus)
**Penetrating infections from dehorning wounds and fractures of facial bones (frontal sinus)
**Expanding mass
*Purulent inflammation of sinuses is likely to become chronic due to poor drainage
*Inflammation may block the drainage of the sinuses and cause distortion of the overlying bones
*May result in empyema, inspissated exudate, in horses
*In sheep often due to [[Respiratory Parasitic Infections - Pathology#Oestrus ovis|''Oestrus ovis'']] infection
=='''Infectious causes of sinusitis'''==
{| cellpadding="10" cellspacing="0" border="1"
| .
| [[Respiratory Viral Infections - Pathology|'''VIRAL''']]
| [[Respiratory Bacterial Infections - Pathology|'''BACTERIAL''']]
| [[Respiratory Fungal Infections - Pathology|'''FUNGAL''']]
| [[Respiratory Parasitic Infections - Pathology|'''PARASITIC''']]
|-
| '''Dogs'''
| .
| secondary
| [[Respiratory Fungal Infections - Pathology#In Dogs|''A. fumigatus'']]
| [[Respiratory Parasitic Infections - Pathology#Linguatula serrata|''Linguatula serrata]]
|-
| .
| .
| .
| .
| [[Respiratory Parasitic Infections - Pathology#Capillaria aerophila|''Capillaria aerophila'']]
|-
| '''Cats'''
| [[Respiratory Viral Infections - Pathology#Feline viral rhinotracheitis|Feline viral rhinotracheitis]]
| secondary
| [[Respiratory Fungal Infections - Pathology#In Cats|''Aspergillus fumigatus'']]
| [[Respiratory Parasitic Infections - Pathology#Linguatula serrata|''Linguatula serrata]] sometimes
|-
| .
| .
| .
| .
| [[Respiratory Parasitic Infections - Pathology#Capillaria aerophila|''Capillaria aerophila'']]
|-
| '''Horses'''
| .
| [[Respiratory Bacterial Infections - Pathology#Strangles|Strangles]]
| [[Respiratory Fungal Infections - Pathology#In Horses|''Aspergillus'' spp.]]
| .
|-
| .
| .
| [[Respiratory Bacterial Infections - Pathology#Streptococcus equi subsp. zooepidemicus|''Streptococcus equi subsp. zooepidemicus'']]
| .
| .
|-
| '''Cattle'''
| .
| secondary
| .
| .
|-
| '''Sheep'''
| .
| .
| .
| [[Respiratory Parasitic Infections - Pathology#Oestrus ovis|''Oestrus ovis'' larvae]]
|-
| '''Pigs'''
| [[Respiratory Viral Infections - Pathology#Inclusion body rhinitis|Inclusion body rhinitis]]
| .
| .
| .
|-
|}
<big>'''For an overview of respiratory infections see [[Respiratory System Inflammation - Pathology]]'''</big>