Thrall chapter 12 MRI features of brain disease in small animals Flashcards
2) Which statement is correct with respect to gadolinium (can be more than one)?
a) Gadolinium results in T1 shortening of tissue in which it accumulates resulting in an increase in T1-signal intensity, that is, the lesion appears brighter than in precontrast images
b) Gadolinium results in T1 shortening of the tissue in which it accumulates resulting in a decrease in T1-signal intensity, that is, the lesion appears darker than in precontrast images.
c) Gadolinium is not used as an MR contrast-medium agent. It fluoresces in response to radiation and is used in the manufacture of radiographic intensifying screens.
d) Gadolinium is a commonly used MR contrast-medium agent. In addition, gadolinium fluoresces in response to radiation and is used in the manufacture of radiographic intensifying screens and some digital flat panels.
A and D
3) Agenesis or rupture of the septum pellucidum…(which answers are false)
a) Is common in border collies with seizures
b) Is typically asymptomatic
c) Is seen in larger brachycephalic breeds
d) Is seen more commonly in older dogs
A and D
4) Match the term with the definition
see image
5) What electrolyte abnormality do dogs with developmental abnormalities of the corpus callosum commonly have?
a) Hyponatraemia
b) Hypernataemia
c) Hyperchloraemia
d) Hyperkalaemia
B
6) Which statement about intracranial epidermoid or dermoid cysts is incorrect?
a) They are commonly located in the fourth ventricle or cerebellopontine angle
b) They occur due to abnormal separation of the neuroectoderm from the ectoderm during development
c) They are common in Chinese crested dogs
d) They do not null in FLAIR sequences
C
7) What is the significance of the structure the large arrow is pointing towards?
a) This is a dorsal atlantoaxial band, the presence is associated with the severity and clinical signs of syringomyelia is Cavalier king Charles spaniels
b) This is a sign of atlantoaxial luxation
c) This is a sign of atlantoaxial instability seen in cats with hyperflexion
A
8) Hepatic insufficiency, particularly due to PSS, can lead to t1 hyperintensity of what area of the brain?
a) Brain stem
b) Lateral geniculate nuclei
c) Olfactory bulb
d) Lentiform nuclei
D
9) What is you diagnosis in this 7 month old cat?
a) Toxoplasma
b) FIP
c) Bacterial meningitis
d) Cryptococcosis
B
10) What is the predictive value of a dural tail sign for a meningioma?
a) 10%
b) 55%
c) 88%
d) 94%
D
11) Choroid plexus tumours commonly occur where? (more than one may be correct)
a) Lateral ventricles
b) Third ventricle
c) Fourth ventricle
d) Quadrigeminal cistern
b and c
12) Which statement is false regarding pituitary tumours?
a) Tumours less than 5mm may not be visible with mri
b) They usually have minimal perilesional oedema
c) They strongly contrast enhance
d) Cystic regions and regions of haemorrhage can be seen
a. if less than 3mm they may not be seen
13) Which cranial nerve is most likely to develop a nerve sheath tumour?
a) II
b) V
c) VII
d) VIII
B
14) Which imaging characteristics would haemorrhage that occurred approximately 1 week ago (assume extracellular methaemoglobin) likely to have?
a) Hypointense on both T1- and T2-weighted sequences
b) Hyperintense on T1-weighted and hypointense on T2-weighted sequences
c) Hyperintense on both T1- and T2-weighted sequences.
d) Hypointense on T1-weighted and hyperintense on T2-weighted sequences
C
15) A signal void in a GRE sequence can be caused by…
a) Haemorrhage
b) Mineralization
c) Gas
d) All of the above
D
16) in what locations are basal and plaque-like meningiomas common?
a) Optic chiasm
b) Suprasellar region
c) Dorsal to the cerebellum
d) Cerebello-pontomedullary region
A and B
