Dignostic MRI in Dogs and Cats Flashcards
1
Q
Which one is true ?
- The iris forms a very thin line anterior to the lens, and due to its transverse orientation is easier to see on transverse or dorsal plane images.
- The ciliary body may be visible as a small hyperintense structure at the periphery of the lens, at the corneoscleral junction.
- Due to its very low water and high protein content, the lens has relatively long T1 and short T2 relaxation times. This explains its hypointense appearance on most pulse sequences.
- The optic disc may be seen as a large, round hypointense structure at the caudal margin of the globe.
A
- Due to its very low water and high protein content, the lens has relatively long T1 and short T2 relaxation times. This explains its hypointense appearance on most pulse sequences.
2
Q
Which are the 2 breed predisposed for persistent hyperplastic tunica vasculosa lentis/persistent hyperplastic primary vitreous?
A
- Doberman Pinscher
- Staffordshire Bull Terrier
3
Q
In case of retinal detachment, the subretinal fluid collection is usually …. To the vitreous on T1w and T2w images.
- Hypointense
- Isointense
- Hyperintense
A
- Hyperintense
4
Q
Extraocular polymyositis, which breed is over represented and at which age?
A
Golden Retriever is overrepresented. Affected dogs are usually 6 to 24 months old, and females are most frequently affected
5
Q
Cites 4 causes of optic neuritis in cats:
A
spread of orbital and nasal cavity infections feline infectious peritonitis toxoplasmosis mycotic infections (cryptococcosis) histoplasmosis systemic hypertension lymphoma.
6
Q
Ocular melanoma are often:
- T2w hyperintense and T1w hyperintense
- T2w hyperintense and T1w hypointense
- T2w hypointense and T1w hyperintense
- T2w hypointense and T1w hypointense
A
- T2w hypointense and T1w hyperintense
7
Q
More than …% of the orbital neoplasms are malignant.
- 75%
- 80%
- 85%
- 90%
A
- 90%
