GIT Pathology 2 Flashcards
Which breed of dog is predisposed to gingival hyperplasia?
Boxers
Which virus causes canine oral papillomatosis?
Canine papillomavirus-1 infection
List two oral neoplasias from dental tissue origin.
Peripheral odontogenic fibroma
Canine acanthomatous ameloblastoma
Which species are peripheral odontogenic fibromas common in and what tissue are they made of?
Dogs, made of fibrous tissue.
Where does the canine acanthomatous ameloblastoma originate from?
Odontogenic epithilum
What is the action of a canine acanthomatous ameloblastoma?
Benign (does not metastasise) but often has aggressive behaviour with invasion of bone.
List three neoplasias of non-dental tissue origin.
Squamous cell carcinoma
Malignant melanoma
Fibrosarcoma
What is the most common oral neoplasm in cats?
Squamous cell carcinoma
List three general features of a squamous cell carcinoma.
Arises from stratified squamous mucosa lining the oral cavity, pharynx and larynx.
Malignant
Locally invasive
Tend to metastasize late in the clinical course.
List common sites of an oral neoplasia.
Ventral surface of the tongue/sublingual close to frenulum
Gingiva
What is the most common malignant oral neoplasm in dogs?
Malignant melanoma
What is the most commong site of the malignant melanoma?
Gums and the lips
What is the second most common oral neoplasm in cats?
Fibrosarcoma
How do fibrosarcomas act in dogs and cats?
Dogs - may metastasize
Cats - low metastatic potential
Describe how a true salivary cyst forms
Salivary gland duct blockage.
Duct remains intact.
Cystic dilation of the salivary gland or duct(s).
Describe how a sialocele/pseudocyst forms.
Salivary gland duct rupture.
Saliva pooling in soft tissue stimulate encapsulation and mild inflammation.
Fluid filled cavity in soft tissues of the mouth or neck.
What is a ranula?
Clinical term to describe a smooth rounded, fluctuant, cystic swelling on the floor of the mouth.
What is inflammation of the salivary gland called?
Sialoadenitis
List three types of mehcanical obstruction of the oesophagus
Intraluminal
Intramural
Extrinsic
How do intraluminal oesophageal obtructions cause disease?
Occlusion
List four presdisposed sites of oesophageal obstruction.
Larynx
Thoracic inlet
Heart base
Diaphragmatic hiatus
List three possible consequences of choke.
Scarring
Stricture
Perforation leading to perioesophageal cellulitis
List four causes of oesophagitis
Traumatic injury or obstruction
Viral diseases
Reflus of gastric acid
Ingestion of caustic/irritant chemicals, plants or dyes
What is the most common neoplasia of the oesophagus?
Squamous cell carcinoma
Describe how megaoesophagus causes clinical signs.
Muscular dysfunction
Failure of peristalisis
Accumulation of ingesta in the oesophagus
Oesophageal dilation
Regurgitation
May have secondary oesophagitis, ulceration
