Ocular Neoplasia

Question 1

What is the most common eyelid tumour in a dog?

Roughly what % of canine eyelid masses are these?

Answer 1

Sebaceous adenoma

40%

Question 2

What is the most common eyelid tumour in a cat?

Answer 2

Squamous cell carcinoma

Question 3

What age range and species get papillomas of the eyelids?

What is the treatment if causing irritation?

Answer 3

Young dogs

Surgical excision followed by Cryotherapy

Question 4

What is thought to be the cause of squamous cell carcinoma of the eyelids in cats?

What is the predisposition?

What does it look like?

Is it metastatic?

What treatment are they sensitive to?

Answer 4

Solar radiation (UV light)

White colour

Ulcerative lesion with a crusted surge T, often looks eroded rather than proliferative.

Yes slowly

Radiation

Question 5

What are haemangiosarcomas of eyelids in cats thought to be caused by?

Good/ bad prognosis?

Answer 5

UV light

Good. Surgical excision tends to be curative

Question 6

Does Eyelid adenocarcinoma in cats have a good or bad prognosis?

Answer 6

Bad!!

Question 7

Does Eyelid lymphoma in cats have a good or bad prognosis?

Answer 7

Bad

Question 8

What is an apocrine hidrocystoma?

What do they look like?

Which breed is predisposed?

Treatment?

Where are they often?

Answer 8

Cystic adenoma of the apocrine sweat glands

Fluid filled blue/ grey lesions on the eyelids

Persians

Medial canthus

Often recur with excision so leave

Question 9

Do peripheral nerve sheath tumours in cats often recur?

Which eyelid is normally affected?

Answer 9

Yes

Upper eyelid

Question 10

What is the most common primary neoplasia of the conjunctiva in dogs?

Answer 10

Mast cell tumours

Question 11

What is the most common primary neoplasia of the conjunctiva in cats?

Answer 11

Squamous cell carcinoma

Question 12

What is the most common secondary neoplasia of the conjunctiva in dogs?

Answer 12

Lymphoma

Question 13

What is the most common secondary neoplasia of the conjunctiva in cats?

Answer 13

Lymphoma

Question 14

What is thought to cause conjunctival haemangioma/ sarcoma?

Where do they normally grow in dogs?

Is excision curative?

Answer 14

UV light

Superior temporal bulbar conjunctiva and leading edge of TEL

Recurrence common. Often use adjunctive tx.

Question 15

Are conjunctival neoplasias in dogs normally malignant or benign?

Which 2 doesn’t fit this?

Answer 15

Benign

Melanoma
Squamous cell carcinoma- locally invasive

Question 16

Where do conjunctival melanomas in cats normally grow?

Are they benign/ malignant?

Answer 16

Bulbar conjunctiva

Malignant and aggressive, recurrence common

Question 17

What do squamous cell carcinoma of the cornea in dogs look like?

What type of dogs is it most commonly seen in?

What is thought to be the cause?

Treatment?

Answer 17

Raised multilobular pinkish mass (cobble appearance)

Brachys

UV light/ topical immunosuppressives

Keratectomy and cryo/ radiation

Question 18

Which dog breeds are predisposed to Limbal melanoma?

What age bracket?

Treatment?

Answer 18

German shepherd
Golden retriever
Lab

Young- grow quickly
Old- more static

Excision, graft. Strontium 90B or cryotherapy

Question 19

What is it important to distinguish a Limbal melanoma from?

Answer 19

Uveal melanoma

Question 20

What is the most common uveal primary neoplasia in the dog?

Answer 20

Melanocytic

Question 21

What is the most common uveal primary neoplasia in the cat?

Answer 21

Feline diffuse iridal melanoma

Question 22

What is the most common uveal secondary neoplasia in the dog?

Answer 22

Lymphoma

Question 23

What is the most common uveal secondary neoplasia in the cat?

Answer 23

Lymphoma

Question 24

Which dog breeds are predisposed to melanocytic tumours of the uvea?

What age bracket?

Most benign/ malignant?

What is a possible secondary issue with these?

Answer 24

German shepherds
Retriever breeds

Older

Benign

Blocking the iridocorneal drainage angle causing glaucoma

Question 25

What percentage of melanocytic uveal tumours in dogs are malignant?

Answer 25

20%

Question 26

What is used when resecting a uveal mass to stop bleeding?

What treatment can be used other than resection?

Answer 26

Wet field cautery

Diode laser if not thick

Question 27

What is another technique other than surgical resection for removing a uveal mass?

Answer 27

Cyclophotocoagulation

Question 28

What are the 3 variations of Feline Post Traumatic Ocular Sarcoma?

Answer 28

Spindle cell (most common + aggressive)
Lymphoma
Osteosarcoma/chondrosarcoma

Question 29

What can cause Feline Post Traumatic Ocular Sarcoma?

Answer 29

Trauma
Rupture of the lens capsule
Chronic uveitis 
Intraocular surgery 
Intravitreal gentamycin injections

Question 30

What % of orbital tumours are malignant in dogs and cats?

Answer 30

90%

Question 31

Are orbital tumours more likely primary or secondary in the;

• cat?
• dog?

Answer 31

Cat - secondary

Dog - primary

Question 32

Mast cell tumours in eyelids in cats…

Normally benign/ malignant?

Sensitive to radiation?

Answer 32

Benign

Yes- strontium 90 beta

Question 33

Mast cell tumours in the conjunctiva of dogs is normally benign/ malignant?

Answer 33

Benign

Question 34

What is the second most common uveal tumour In the dog?

Answer 34

Adenoma/ adenocarcinoma 50:50

Question 35

What are these on the cornea?

Answer 35

Keratic precipitates