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Nasal Cavity - Degenerative Pathology (view source)
Revision as of 21:33, 4 August 2008
, 21:33, 4 August 2008no edit summary
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==In Horses==
===Nasal septum abnormalities===
*Thickening caused by
**Trauma
**Infection
**[[Nasal Cavity Hyperplastic and Neoplastic - Pathology|Neoplasia of nasal septum]], carcinomas most common
**Amyloidosis (below)
**[[Nasal Cavity Developmental - Pathology#Wry nose|Wry nose]]
**[[Paranasal Sinuses Inflammatory - Pathology|Empyema]], [[Paranasal Sinuses Hyperplastic and Neoplastic - Pathology|neoplasia]], [[Paranasal sinuses - Pathology|cysts]] of sinuses
===Nasal amyloidosis===
*Deposition of amyloid in nasal submucosa of horses
*Not part of generalised amyloidosis
*May extend to [[Larynx - Anatomy & Physiology|larynx]]
*Nodular of diffuse
*Stenosis may cause obstruction
*Smooth surface, waxy sheen on cut surface
*Macrophages and lymphocytes, giant cells
*May have overlying ulceration of mucosa
*Large firm nodules in alar folds, rostral nasal septum and floor of nasal cavity
*Micro:
**Deposition of hyaline material in nasal mucosa
==Circulatory disturbances==
===Congestion and Hyperaemia===
*Congestion - passive interference with venous return
**Non-specific
**Commonly found at post-mortem
*Hyperaemia - active vasodilation
**Associated with early stages of inflammation
===Haemorrhage===
*Can result from local trauma or just transfer blood from lower down in the respiratory tract (see [[Respiratory System Clinical Signs - Pathology#Epistaxis|epistaxis]])