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==Description==  

==Introduction==  

The lesions appear as masses that are friable and ulcerated. Many amyloid-producing odontogenic tumours are [[Neoplasia - Pathology#Nomenclature|melanotic]] which makes them difficult to distinguish from the more aggressive malignant melanoma. They can erode but not infiltrate adjacent bone.

The lesions are slow growing and locally invasive.The most prominent feature of this type of tumour is that it produces amyloid which tends to calcify.

==Typical Signalment==

==Typical Signalment==

This is a common odontogenic tumour in cats and more rarely found in dogs.

This is a rare tumour seen more often in cats and than in dogs.

==Diagnosis==

==Diagnosis==

===Clinical Signs===

===Clinical Signs===

Include halitosis, oral bleeding, dental disruption or loss, facial or mandibular deformity, excessive salivation, growth protruding from the mouth and rarely dysphagia.

Include halitosis, oral bleeding, dental disruption or loss, facial or mandibular deformity, excessive salivation, growth protruding from the mouth and rarely dysphagia.

   

   

===Diagnostic Imaging===

===Diagnostic Imaging===

Skull radiography may show a soft tissue opacity  with mineralization within the mass. Periosteal reaction of the adjacent bone may be visualised. If a malignant neoplasm is a dignostic possibility, thoracic radiography should be carried out to evaluate for lung metastases.

Skull radiography may show a soft tissue opacity  with mineralization within the mass. Periosteal reaction of the adjacent bone may be visualised. If a malignant neoplasm is a diagnostic possibility, thoracic radiography should be carried out to evaluate for lung metastases.

 

===Biopsy===

===Biopsy===

 

Biopsy is required for a definitive diagnosis.

Required for a definitive diagnosis

Incisional biopsy is the best option, when undertaking cytological or grab procedures it is difficult to obtain a representative sample.

Incisional Biopsy is the best option, when undertaking cytological or grab procedures it is difficult to obtain a representative sample.

Histologically, the tumour appears to be well demarcated from the surrounding tissue but is not encapsulated.

Histologically, the tumour appears to be well demarcated from the surrounding tissue but is not encapsulated.

==Prognosis==

==Prognosis==

*Good following complete surgical excision.

Good following complete surgical excision however recurrance following incomplete surgical excision is possible.

*Recurrance following incomplete surgical excision is possible.

 

 

==References==

==References==

*Tutt, C., Deeprose, J. and Crossley, D. (2007) '''BSAVA Manual of Canine and Feline Dentistry (3rd Edition)''' ''BSAVA''

Tutt, C., Deeprose, J. and Crossley, D. (2007) '''BSAVA Manual of Canine and Feline Dentistry (3rd Edition)''' ''BSAVA''

 

 

 

 

 

[[Category:Neoplasia]]

[[Category:Neoplasia]]