Ocular Neoplasia Flashcards
What is the most common eyelid tumour in a dog?
Roughly what % of canine eyelid masses are these?
Sebaceous adenoma
40%
What is the most common eyelid tumour in a cat?
Squamous cell carcinoma
What age range and species get papillomas of the eyelids?
What is the treatment if causing irritation?
Young dogs
Surgical excision followed by Cryotherapy
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?
Solar radiation (UV light)
White colour
Ulcerative lesion with a crusted surge T, often looks eroded rather than proliferative.
Yes slowly
Radiation
What are haemangiosarcomas of eyelids in cats thought to be caused by?
Good/ bad prognosis?
UV light
Good. Surgical excision tends to be curative
Does Eyelid adenocarcinoma in cats have a good or bad prognosis?
Bad!!
Does Eyelid lymphoma in cats have a good or bad prognosis?
Bad
What is an apocrine hidrocystoma?
What do they look like?
Which breed is predisposed?
Treatment?
Where are they often?
Cystic adenoma of the apocrine sweat glands
Fluid filled blue/ grey lesions on the eyelids
Persians
Medial canthus
Often recur with excision so leave
Do peripheral nerve sheath tumours in cats often recur?
Which eyelid is normally affected?
Yes
Upper eyelid
What is the most common primary neoplasia of the conjunctiva in dogs?
Mast cell tumours
What is the most common primary neoplasia of the conjunctiva in cats?
Squamous cell carcinoma
What is the most common secondary neoplasia of the conjunctiva in dogs?
Lymphoma
What is the most common secondary neoplasia of the conjunctiva in cats?
Lymphoma
What is thought to cause conjunctival haemangioma/ sarcoma?
Where do they normally grow in dogs?
Is excision curative?
UV light
Superior temporal bulbar conjunctiva and leading edge of TEL
Recurrence common. Often use adjunctive tx.
Are conjunctival neoplasias in dogs normally malignant or benign?
Which 2 doesn’t fit this?
Benign
Melanoma
Squamous cell carcinoma- locally invasive
Where do conjunctival melanomas in cats normally grow?
Are they benign/ malignant?
Bulbar conjunctiva
Malignant and aggressive, recurrence common
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?
Raised multilobular pinkish mass (cobble appearance)
Brachys
UV light/ topical immunosuppressives
Keratectomy and cryo/ radiation
Which dog breeds are predisposed to Limbal melanoma?
What age bracket?
Treatment?
German shepherd
Golden retriever
Lab
Young- grow quickly
Old- more static
Excision, graft. Strontium 90B or cryotherapy
What is it important to distinguish a Limbal melanoma from?
Uveal melanoma
What is the most common uveal primary neoplasia in the dog?
Melanocytic
What is the most common uveal primary neoplasia in the cat?
Feline diffuse iridal melanoma
What is the most common uveal secondary neoplasia in the dog?
Lymphoma
What is the most common uveal secondary neoplasia in the cat?
Lymphoma
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?
German shepherds
Retriever breeds
Older
Benign
Blocking the iridocorneal drainage angle causing glaucoma
What percentage of melanocytic uveal tumours in dogs are malignant?
20%
What is used when resecting a uveal mass to stop bleeding?
What treatment can be used other than resection?
Wet field cautery
Diode laser if not thick
What is another technique other than surgical resection for removing a uveal mass?
Cyclophotocoagulation
What are the 3 variations of Feline Post Traumatic Ocular Sarcoma?
Spindle cell (most common + aggressive)
Lymphoma
Osteosarcoma/chondrosarcoma
What can cause Feline Post Traumatic Ocular Sarcoma?
Trauma Rupture of the lens capsule Chronic uveitis Intraocular surgery Intravitreal gentamycin injections
What % of orbital tumours are malignant in dogs and cats?
90%
Are orbital tumours more likely primary or secondary in the;
- cat?
- dog?
Cat - secondary
Dog - primary
Mast cell tumours in eyelids in cats…
Normally benign/ malignant?
Sensitive to radiation?
Benign
Yes- strontium 90 beta
Mast cell tumours in the conjunctiva of dogs is normally benign/ malignant?
Benign
What is the second most common uveal tumour In the dog?
Adenoma/ adenocarcinoma 50:50
What are these on the cornea?
Keratic precipitates
