1.1.1: Canine and feline nasal disease Flashcards

1
Q

Signs of nasal disease

A
  • Sneezing
  • Snorting
  • Nasal discharge
  • Epistaxis
  • Nasal pain (common with neoplasia)
  • Nasal ulceration / loss of pigment around the nostrils
  • Reverse sneezing is not usually a sign of severe disease
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2
Q

If nasal discharge (e.g. mucoid, bloody) starts unilateral and then becomes bilateral, what does this tell you about the disease process?

A
  • If it starts unilateral and then goes bilateral, the disease is getting worse
  • Crossing the midline means destruction is occurring
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3
Q

What history questions could you ask when investigating nasal disease?

A
  • When was the animal last seen normal? (Classify disease as acute vs chronic)
  • Is it one or both nares affected?
  • Nature of discharge? Presence of blood?
  • Any pain?
  • Any difficulty eating?
  • Any halitosis?
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4
Q

What aspects of the clinical exam will you pay particular attention to in the animal with nasal disease?

A
  • Symmetry
  • Eyes
  • Pain (palpate over the dorsum of the nose and sinuses)
  • Air flow
  • Teeth
  • Nasal planum depigmentation
  • Lymph nodes
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5
Q

Differential diagnoses for chronic nasal disease

A
  • Foreign body
  • Neoplasia (±epistaxis, esp if unilateral)
  • Aspergillosis (±epistaxis)
  • Rhinitis e.g. allergic rhinitis is a diagnosis of exclusion. Primary bacterial rhinitis is rare!
  • Dental disease
  • Chronic post-viral disease in cats (e.g. kittens infected with herpes developing chronic issues)

Common in bold.

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6
Q

What should you consider if there is epistaxis and blood in any other body system?

A

Clotting disorders are always a possibility. Epistaxis could be an early sign.

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7
Q

Describe the cause and pathogenesis of chronic rhinitis in cats

A
  • Feline herpesvirus 1 is suspected to play a role in chronic nasal inflammation resulting in destructive rhinitis (turbinates can be destroyed)
  • There is inflammation and swelling of the conchae -> increased mucus production and secondary infection
  • Mucopurulent secretion may contain blood -> sometimes disease is severe enough to result in loss of conchae
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8
Q

Diagnosis of chronic rhinitis in cats

A
  • Noticeable on rhinoscopy as loss of conchae / turbinates means there is lots of room to move the rhinoscope
  • Appearance of chronic post-viral rhinitis in cats appears similar endoscopically to aspergillosis of nasal passages in dogs
  • May have history of respiratory disease / viral infection as a kitten
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9
Q

3 most common causes of chronic nasal disease in cats

A
  1. Tumours
  2. Foreign bodies e.g. grass blades
  3. Rhinitis

Polyps are also a possibility. Other causes are miscellaneous or undiagnosed.

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10
Q

Which fungi most commonly causes fungal rhinitis in dogs?

A

A. fumigatus (causes aspergillosis)

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11
Q

Which species is fungal rhinitis more common in?

A
  • Mainly seen in dogs, especially in medium to long-nosed breeds
  • Rare in cats
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12
Q

Describe the pathogenesis of aspergillosis / fungal rhinitis

A
  • A. fumigatus often causes fungal rhinitis
  • Disease is generally restricted to the nasal cavity and sinuses but is markedly destructive to the turbinates
  • It can erode the frontal bones and cribiform plate, even getting into the brain
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13
Q

Clinical signs of fungal rhinitis / aspergillosis

A
  • Nasal discharge: may be mucopurulent with intermittent epistaxis
  • Discharge may progress from unilateral to bilateral.
  • Discharge often smells dank (like a cellar)
  • Ulceration / depigmentation of the nasal planum
  • Pain on palpation
  • Sneezing
  • Facial deformity
  • Neuro signs
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14
Q

Diagnosis of fungal rhinitis / aspergillosis

A
  • History and clinical signs
  • Imaging: radiography of nose and sinuses / CT or MRI if available
  • Rhinoscopy: rigid or flexible endoscope. Flexible allows anterograde sinuscopy. Can take guided biopsy.
  • Cytology
  • Serology
  • Best method: visualise the plaque or culture the fungus from a sample
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15
Q

What are the disadvantages of using serology to diagnose aspergillosis?

A
  • Sensitivity and specificity not great
  • Can produce false negatives commonly
  • Can produce false positives if the animal has previously had and cleared the infection
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16
Q

What are the advantages of using rhinoscopy for diagnosis of aspergillosis?

A
  • Can take a guided biopsy at the same time -> this is important as a swab would be insufficient for diagnosis; you need to be in the lesion
  • Can visualise plaques and remove them at the same time (this is treatment)
17
Q

Treatment of aspergillosis

A
  • Challenging
  • Topical therapy: enicoazole, clotrimazole
  • Delivery can be surgical or minimally invasive
  • Minimally invasive: catheter placement under GA
  • Surgical: drill hole into frontal sinuses and place catheter. Treat second time 7-14 days post initial surgery. 80% success rate. Usually done at same time as rhinoscopy if highly suspicious of aspergillosis.
  • Oral antifungal agents no longer recommended due to long course and severe side effects.
18
Q
A

This is Squamous cell carcinomas on the nasal planum of white cats due to solar exposure

19
Q

Describe the development of squamous cell carcinomas in white cats

A
  • Seen on nasal planum of white cats with solar exposure; rare in dogs
  • Carcinoma in situ -> superficial squamous cell carcinoma -> infiltrative squamous cell carcinoma (locally invasive, mets rare)
20
Q

Treatment of nasal squamous cell carcinomas in cats

A

Options:
* Photodynamic therapy (PDT) - may need repeat sessions
* Planectomy - good prognosis with nose off
* Immunomodulators e.g. imiquimod
* Can affected ears as well. If caught early, respond well to surgery.
* Generally referral for surgery is done.

21
Q

Which kinds of neoplasia are most common in nasal cavities of dogs?

A
  • Carcinomas
  • Rarely squamous cell carcinomas
  • Lymphoma, fibrosarcoma, chondrosarcomas, osteosarcomas
22
Q

What kinds of neoplasia are most common in nasal cavities of cats?

A
  • Adenocarcinomas or lymphoma most likely
  • (Squamous cell carcinomas on surface of nasal planum)

Lymphoma is usually a safe bet in cats.

23
Q

Investigation and treatment of nasal cavity neoplasia

A
  • CT / MRI then rhinoscopy and biopsy
  • Therapy: radiotherapy ± chemo ± NSAIDs
  • Cannot achieve good margins with surgery
  • Prognosis guarded even with radiotherapy
  • There are no good oral and nasal tumours in dogs and cats
24
Q
A

Nasal tumour that has crossed the midline

25
Q

Causes and presentation of pharyngeal disease

A

Common presentation: dysphagia (client may report difficulty eating so need to confirm that it is swallowing that is the problem).

Possible causes
* Foreign body
* Neoplasia
* Nasopharyngeal polyps (cats)
* BOAS

26
Q

Presentation of nasopharyngeal polyps in cats

A
  • Laboure and noisy breathing
  • Nasal discharge
  • Head shaking
  • Sneezing
  • Difficulty swallowing
27
Q

True/false: neoplasia of the larynx and trachea is common in dogs and cats.

A

False
It is rare but on the list of differentials for URT dyspnoea.
* Dogs: oncocytoma, rhabdomyosarcoma, tracheal cartilagenous tumours, OSA, fibrosarcoma, SCC all possible
* Cats: laryngeal lymphoma recognised but rare
* Usually diagnosed on exam under GA, then biopsy if possible.
* Tracheal masses may be benign and resectable but refer for surgery

28
Q

Optimal diagnostic plan for nasal cavity disease

A
  1. CT = optimal. Cost ~£2000
  2. Rhinoscopy
  3. Nasal radiography
  4. Serology for aspergillosis
  5. Nasal flush

This list is ordered in terms of gold standard/ preference - you would not be aiming to do all of these for the given case.

29
Q

How would aspergillosis appear on rhinoscopy

A
  • White plaques
  • Blood - very easy to make the nose bleed
30
Q

What does the arrow indicate?

A

Area of soft tissue density = foreign body (in this case a grass seed)

31
Q
A

This shows advanced neoplasia which has crossed the midline

32
Q

Where should you check for foreign bodies especially grass blades in cats?

A
  • Behind the soft palate
  • Hard if you don’t have a flexible endoscope; try to look with a dental mirror
33
Q

Describe how you would attempt nasal radiography and its advantages and disadvantages

A
  • Opt for open-mouth, intraoral view where the film is in the animal’s mouth and radiograph dorsoventrally
    ✅ Can identify/ potentially rule out destructive diseases
    ❌ Difficult to generate
    ❌ Teeth get in the way
    ❌ Limited use, CT is better
34
Q

Describe how to perform a nasal flush, and its advantages and disadvantages

A
  • Anaesthetise the animal, pack the pharynx with swabs in order to not push saline into the lungs
  • Collect what is blown to the back of the pharynx

✅ Cheap especially if animal under GA
✅ Can sometimes be lucky e.g. if a chunk of tumour comes out
❌ Not sensitive, may yield nothing