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|melanoma]]. They can erode but not infiltrate adjacent bone. The most prominent feature of this type of tumour is that it produces amyloid which tends to calcify. | 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|melanoma]]. They can erode but not infiltrate adjacent bone. The most prominent feature of this type of tumour is that it produces amyloid which tends to calcify. |