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Ocular neoplasia in dogs I Venter (Vet360, Vol 9, Issue 2)
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1.
Which one characteristic regarding canine peri-ocular and eyelid tumours listed below is INCORRECT?
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a. Most canine eyelid tumours are minimally invasive.
b. Canine eyelid tumours are easily distinguished from conjunctival tumours.
c. Metastasis from canine eyelid tumours is unlikely.
d. Most eyelid tumours occur in dogs over 10 years old.
e. Some eyelid tumours may regress spontaneously .
2.
Which one of the statements regarding canine eyelid tumours is INCORRECT?
a. The meibomian glands of the eyelid margin are the adnexal structure most frequently affected by neoplasia.
b. Histologically these neoplasms can be categorised as adenomas, epitheliomas and carcinomas.
c. Carcinomas are be more likely to be ulcerated in clinical appearance.
d. Meibomian gland tunours can cause local irritation.
e. For smaller tumours involving less than 25% of the eyelid margin, a full-thickness wedge resection should be used.
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3.
Which one of the statements regarding squamous cell carcinoma (SCC) in the eyelids of dogs is INCORRECT
a. Squamous cell carcinoma of the eyelids is not that common in dogs.
b. SCC is seen in patients with unpigmented eyelids after long standing solar blepharitis.
c. SCC is very infiltrative and may metastasize to regional lymph nodes and distant sites.
d. Clinical signs of solar blepharitis include erythema and ulcerations of the eyelid margin.
e. Prevention of solar blepharitis includes topical corticosteroids eyedrops or eyelid tattooing.
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4.
Ultraviolet radiation to the eyelids and eye structures can cause disease. Which one of the conditions listed below is NOT linked to UV exposure.
a. Haemangioma
b. Haemangiosarcoma
c. Solar blepharitis
d. Melanoma
e. Squamous cell carcinoma
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5.
Which one of the statements below regarding tumours of the third eyelid is INCORRECT?
a. Neoplasia of the third eyelid is uncommon in the dog.
b. Conjunctival melanomas most commonly involve the third eyelid.
c. Melanomas, adenomas, adenocarcinomas, squamous cell carcinomas and haemangiomas, have all been reported.
d. Adenocarcinoma of the third eyelid is the most common of the possible third eyelid neoplasms.
e. Prolapse of the gland of the third eyelid (cherry eye) is an important differential for an adenoma of the third eyelid.
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6.
Melanoma is a tumour which frequent affects the eye and related structures. Which one of the following statements is CORRECT?
a. Melanomas affecting the eyelid structure are uncommon.
b. Conjunctival melanomas are malignant.
c. Limbal melanomas in older dogs are typically invasive and metastatic.
d. Uveal melanomas have a high metastatic rate.
e. Melanomas affecting the eye are typically non-pigmented.
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7.
Conjunctival haemangiomas and hemangiosarcoma occur in the dog. Which one of the statements listed below is INCORRECT?
a. Conjunctival haemangiomas and hemangiosarcoma tend to occur at the nonpigmented, leading edge of the third eyelid as well as the temporal bulbar conjunctiva.
b. Collie breeds are predisposed.
c. Haemangiomas stay confined to the conjunctiva but hemangiosarcoma can infiltrate.
d. The conjunctival masses are bright red fluctuant well circumscribed massed.
e. Enucleation is required for cure.
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8.
Which one of the following statements regarding limbal melanomas in dogs is INCORRECT?
a. Limbal melanomas appear clinically as darkly pigmented masses.
b. They may invade the cornea or intra-ocular structures.
c. They are typically benign neoplasms.
d. In younger dogs the growth is more benign than in older dogs
e. Enucleation is the method of choice for cure.
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9.
Which one of the following statements regarding ciliary tumours in the dog is INCORRECT?
a. Iridociliary epithelial tumours occour commonly in dogs
b. The incidences of adenoma (benign) and adenocarcinoma (potentially malignant) are approximately equal.
c. Iridociliary adenocarcinoma has a high incidence of metastasis
d. The clinical presentation may appear similar to that of melanoma.
e. The tumours may extend through the pupil or invade the iris
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10.
Which one of the following statements regarding ocular lymphoma in dogs is INCORRECT
a. Systemic lymphoma should be considered as a differential for anterior uveitis even in the absence of lymphadenopathy.
b. A solid uveal mass seen through the pupil is typical with ocular lymphoma
c. Ocular signs are seen commonly with lymphosarcoma.
d. Ocular lymphoma can mimic inflammation
e. B cell lymphoma is most commonly implicated in ocular lymphoma.
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