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→Infectious causes of sinusitis
=='''Sinusitis'''==
|backcolour = D1EEEE
|linkpage =Cardiorespiratory System - Pathology
*Often undetected unless it causes facial deformity or a draining tract onto the skin
|linktext =Cardiorespiratory System
*Seromucous sinuitis in not significant, often an extension of viral infection in [[Rhinitis#Rhinitis|nasal cavity]]
|maplink = Cardiorespiratory System (Content Map) - Pathology
*Purulent sinusitis tends to obstruct drainage -> chronic purulent sinusitis
|pagetype =Pathology
*Most important in horses due to their complex sinuses
|sublink1=Paranasal sinuses - Pathology
*'''Primary''':
|subtext1=PARANASAL SINUSES
**Young horses are more prone as they are susceptible to [[Strangles|Strangles]]
}}
**Following transient systemic [[:Category:Streptococcus species|''Streptococcus'']] infection
**Rarely [[:Category:Respiratory Fungal Infections|fungal infections]]
*'''Secondary''':
**Most common sequel to [[Rhinitis#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 [[Oestrus ovis|''Oestrus ovis'']] infection
=='''Infectious causes of sinusitis'''==
{| cellpadding="10" cellspacing="0" border="1"
| .
| [[:Category:Respiratory Viral Infections|'''VIRAL''']]
| [[:Category:Respiratory Bacterial Infections|'''BACTERIAL''']]
| [[:Category:Respiratory Fungal Infections|'''FUNGAL''']]
| [[:Category:Respiratory Parasitic Infections|'''PARASITIC''']]
|-
| '''Dogs'''
| .
| secondary
| [[Aspergillus spp.|''A. fumigatus'']]
| [[Linguatula serrata|''Linguatula serrata]]
|-
| .
| .
| .
| .
| [[Capillaria|''Capillaria aerophila'']]
|-
| '''Cats'''
| [[Feline Herpesvirus 1|Feline Herpesvirus 1]]
| secondary
| [[Aspergillus spp.|''Aspergillus fumigatus'']]
| [[Linguatula serrata|''Linguatula serrata]] sometimes
|-
| .
| .
| .
| .
| [[Capillaria|''Capillaria aerophila'']]
|-
| '''Horses'''
| .
| [[Strangles|Strangles]]
| [[Aspergillus spp.|''Aspergillus'' spp.]]
| .
|-
| .
| .
| ''[[Streptococcus equi subsp. zooepidemicus]]
| .
| .
|-
| '''Cattle'''
| .
| secondary
| .
| .
|-
| '''Sheep'''
| .
| .
| .
| [[Oestrus ovis|''Oestrus ovis'' larvae]]
|-
| '''Pigs'''
| [[Inclusion Body Rhinitis|Inclusion body rhinitis]]
| .
| .
| .
|-
|}
[[Category:Paranasal Sinuses - Pathology]]
[[Category:Respiratory System - Inflammatory Pathology]]