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Radiology MCQ Bank Forum Hot - Unanswered
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syndrome_xySend an Instant Message to syndrome_xy  




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Quick Scroll neuroradiology 12.26.05 (2 years ago) #1
which of the following is associated with hypotense signal in T1 weighted imaging :
a. melanin
b. lipoma
c. high protein content
d. all the above
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Quick Scroll Neurorad Q2 12.26.05 (2 years ago) #2
horseshoe of boomerang configuration of the brain is seen in :
a. alobar holoprosencephaly
b. semilobar holoprosencephaly
c. lobar holoprosencephaly
d. all the above
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Quick Scroll Q3 12.26.05 (2 years ago) #3
which of the following is associated with hypointense signal on T1 weighted imaging :
a. oedema
b. haemosiderin
c. rapidly flowing blood.
d. all the above
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Quick Scroll Re: neuroradiology 12.26.05 (2 years ago) #4
syndrome_xy wrote:
which of the following is associated with hypotense signal in T1 weighted imaging :
a. melanin
b. lipoma
c. high protein content
d. all the above


IF the q is HYPERINTENSE: then the answer is all. If u are asking HYPOINTENSE- then the answer is none. coz all the above are hyperintense on T1W

ref: chapman radio 4th ed pg 452
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Quick Scroll 12.26.05 (2 years ago) #5
High signal on T1W MRI:

Normal:

1) post lobe of pituitary
2)moving structures : flow related enhancement
3) ossification of the falx
4) calcification within basal ganglia
5) rathke's cleft cyst
6) fat

pathological:

1) hemorrhage
2) thrombus
3) fat: lipoma. dermoids may also have high fat content
4) proteinaceous fluid: eg: craniopharyngioma, colloid cyst
5) melanin
6) heavy metals: eg: manganese in TPN & wilson's dis
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Quick Scroll 12.26.05 (2 years ago) #6
ooops.. thnx trinity. ur rite, thats hyperintense and the answer is all the above.

Error regretted.
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Quick Scroll Re: Q3 12.26.05 (2 years ago) #7
syndrome_xy wrote:
which of the following is associated with hypointense signal on T1 weighted imaging :
a. oedema
b. haemosiderin
c. rapidly flowing blood.
d. all the above


ref. harri pg 2351 & 2353:

structures containing more water , such as CSF & edema, have long T1 & T2 relaxation rates, a LOW signal intensity on T1W images & high signal intensity on T2W images

Fast flowing blood returns no signal (flow void) on routine T1W or T2W spin echo MR images.

I cld not find for hemosiderin! But iif the q is framed correctly, then the answer shld be all of the above (d)
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Quick Scroll 12.26.05 (2 years ago) #8
because of the strong magnetic susceptibiltiy effects ferritin and haemosiderin appear hypointense in T1w images.
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Quick Scroll Re: Neurorad Q2 12.26.05 (2 years ago) #9
syndrome_xy wrote:
horseshoe of boomerang configuration of the <a href="http://www.rxpgonline.com/tutorial/?q=brain&s=0">brain</a>
is seen in :
a. alobar holoprosencephaly
b. semilobar holoprosencephaly
c. lobar holoprosencephaly
d. all the above


Is it alobar holoprosencephaly!!
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Quick Scroll ans - alobar holoprosencephaly 12.26.05 (2 years ago) #10
syndrome_xy wrote:
horseshoe of boomerang configuration of the brain is seen in :
a. alobar holoprosencephaly
b. semilobar holoprosencephaly
c. lobar holoprosencephaly
d. all the above


ans : a)

Holoprosencephaly is a complex intracranial abnormality characterized by absent or incomplete cleavage of the Prosencephalon

MC chromosome invloved is Chromosome 13

Recurrence risk after an isolated case of holoprosencephaly with normal chromosome is 5-6%

Complete or partial failure in division of the developing cerebrum (Prosencephalon) into hemispheres and lobes results in the Holoprosencephalies.

Alobar form is rare malformation consisting of large Holospheric Brain. Alobar holoprosencephaly is characterized by nearly complete lack of ventricular and hemispheric cleavage.

Brain parenchyma shows Horseshoe or Boomerang configuration

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BTW - wats the ans given ?
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