Difference between revisions of "Mandibular Osteomyelitis"
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| − | == | + | {| cellpadding="10" cellspacing="0" border="1" |
| + | | Also known as: | ||
| + | | '''Lumpy jaw<br> | ||
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| + | ==Description== | ||
[[File:actinomyces bovis.jpg|right|thumb|250px|<small><center> bovine actinomycosis, 3-years-old bull, 2-month evolution. (L. Mahin | [[File:actinomyces bovis.jpg|right|thumb|250px|<small><center> bovine actinomycosis, 3-years-old bull, 2-month evolution. (L. Mahin | ||
2008, Wikimedia commons)</center></small>]] | 2008, Wikimedia commons)</center></small>]] | ||
| − | '''Lumpy jaw''' is a chronic infectious condition which affects cattle. It is caused by the anaerobic filamentous bacteria [[Actinomyces bovis|''Actinomyces bovis'']] | + | '''Lumpy jaw''' is a chronic infectious condition which affects cattle. It is caused by the anaerobic filamentous bacteria [[Actinomyces bovis|''Actinomyces bovis'']] |
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Actinomyces is a normal commensal of the oral cavity, upper respiratory tract and digestive tract of cattle, it gains entry to underlying soft tissues when the mucosa is damaged by trauma or eruption of teeth. It causes an inflammatory reaction, the connective tissue proliferates and is followed by infiltration of leukocytes which results in the formation of a walled off granuloma. The granuloma invades the bones of the head, in particular the mandible, and continues to grow in size. | Actinomyces is a normal commensal of the oral cavity, upper respiratory tract and digestive tract of cattle, it gains entry to underlying soft tissues when the mucosa is damaged by trauma or eruption of teeth. It causes an inflammatory reaction, the connective tissue proliferates and is followed by infiltration of leukocytes which results in the formation of a walled off granuloma. The granuloma invades the bones of the head, in particular the mandible, and continues to grow in size. | ||
| − | Lesions are | + | Lesions are charcterised by gross swelling, abscesses and draining fistulae overlying granulation of the madible and maxila. In some cases the [[Oesophagus - Anatomy & Physiology|oesophagus]] and [[Oesophageal groove|oesophageal groove]] may become involoved but the lymph nodes are not affected. |
==Signalment== | ==Signalment== | ||
| − | The condition affects cattle''' 2-5 yrs''' old. It is found worldwide but is most | + | The condition affects cattle''' 2-5 yrs''' old. It is found worldwide but is most prevelent in Western and mid-western states of the USA. |
==Diagnosis== | ==Diagnosis== | ||
| − | The condition is easily diagnosed on clinical signs and can be confirmed by crushing and staining the yellow granules expressed with the pus from skin | + | The condition is easily diagnosed on clinical signs and can be confirmed by crushing and staining the yellow granules expressed with the pus from skin leisions to reveal '''gram-positive filamentous rods'''. |
===Clinical signs=== | ===Clinical signs=== | ||
*Facial distortment | *Facial distortment | ||
| − | *Granuloma formation overlying the mandible and | + | *Granuloma formation overlying the mandible and maxila |
*Fistulae draining small amounts of thick pus with yellow granules | *Fistulae draining small amounts of thick pus with yellow granules | ||
*Difficulties with mastication | *Difficulties with mastication | ||
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==Treatment== | ==Treatment== | ||
Treatment is difficult due to the nature of the lesions and poor antibiotic penetration to the site of infection. | Treatment is difficult due to the nature of the lesions and poor antibiotic penetration to the site of infection. | ||
| − | In less severe cases where infection of the bones is not advanced treatment with [[Penicillins|penicillin]] or [[Tetracyclines|tetracyclines]] is recommended. Previously it has been | + | In less severe cases where infection of the bones is not advanced treatment with [[Penicillins|penicillin]] or [[Tetracyclines|tetracyclines]] is recommended. Previously it has been sugested that systemic treatment with potassium iodide is successful but this is no longer recommended due to food safety concerns. |
==Prognosis== | ==Prognosis== | ||
| − | Treatment is rarely successful in advanced cases and recurrence of | + | Treatment is rarely successful in advanced cases and recurrence of leisions is common; slaughter is advised. |
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==References== | ==References== | ||
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* Merck & Co (2008) '''The Merck Veterinary Manual (Eighth Edition)''' ''Merial'' | * Merck & Co (2008) '''The Merck Veterinary Manual (Eighth Edition)''' ''Merial'' | ||
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[[Category:Teeth_-_Inflammatory_Pathology]] | [[Category:Teeth_-_Inflammatory_Pathology]] | ||
| − | [[Category: | + | [[Category:Cattle]] |
| − | + | [[Category:To_Do_- lizzyk]] | |
Revision as of 20:52, 26 July 2010
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This article is still under construction. |
Description
Lumpy jaw is a chronic infectious condition which affects cattle. It is caused by the anaerobic filamentous bacteria Actinomyces bovis Actinomyces is a normal commensal of the oral cavity, upper respiratory tract and digestive tract of cattle, it gains entry to underlying soft tissues when the mucosa is damaged by trauma or eruption of teeth. It causes an inflammatory reaction, the connective tissue proliferates and is followed by infiltration of leukocytes which results in the formation of a walled off granuloma. The granuloma invades the bones of the head, in particular the mandible, and continues to grow in size. Lesions are charcterised by gross swelling, abscesses and draining fistulae overlying granulation of the madible and maxila. In some cases the oesophagus and oesophageal groove may become involoved but the lymph nodes are not affected.
Signalment
The condition affects cattle 2-5 yrs old. It is found worldwide but is most prevelent in Western and mid-western states of the USA.
Diagnosis
The condition is easily diagnosed on clinical signs and can be confirmed by crushing and staining the yellow granules expressed with the pus from skin leisions to reveal gram-positive filamentous rods.
Clinical signs
- Facial distortment
- Granuloma formation overlying the mandible and maxila
- Fistulae draining small amounts of thick pus with yellow granules
- Difficulties with mastication
- Loose teeth
- Dyspnoea
Pathology
Osteomyelitis of the bones of the head with surrounding granulomatous tissue and fistulae draining pus containing small yellow granules.
Treatment
Treatment is difficult due to the nature of the lesions and poor antibiotic penetration to the site of infection. In less severe cases where infection of the bones is not advanced treatment with penicillin or tetracyclines is recommended. Previously it has been sugested that systemic treatment with potassium iodide is successful but this is no longer recommended due to food safety concerns.
Prognosis
Treatment is rarely successful in advanced cases and recurrence of leisions is common; slaughter is advised.
References
- Andrews, A.H, Blowey, R.W, Boyd, H and Eddy, R.G. (2004) Bovine Medicine (Second edition), Blackwell Publishing
- Merck & Co (2008) The Merck Veterinary Manual (Eighth Edition) Merial
| Also known as: | Lumpy jaw |