Neuroradiology

Question 1

Answer 1

Question 2

Answer 2

Question 3

Answer 3

Question 4

brightest and darkest tissues on CT

Answer 4

bright: highest density (e.g. bone)
black: lowest density (air, fat)

Question 5

blood is ___ on CT

Answer 5

bright/white

d/t atomic density (Fe)

applies to both clotted and flowing

clotted - additional density from clot retraction

Question 6

Answer 6

clot in superior saggital sinus (CT with contrast)

notice empty delta sign (empty white triangle at arrow, compare normal below on no contrast)

Question 7

Answer 7

epidural hematoma (CT)

Question 8

Answer 8

subdural hematoma (acute)

Question 9

Answer 9

chronic subdural hematoma

note that it is nearly isodense with brain d/t age (can be even more isodense)

Question 10

Answer 10

acute subdural hematoma along tentorium

Question 11

Answer 11

multiple system atrophy (most likely)

“hot cross bun” sign

(can be seen in different forms of cerebellar dysfunction but a classic finding in MSA)

Question 12

Answer 12

Question 13

Answer 13

astrocytoma

Question 14

Answer 14

astrocytoma

Question 15

Answer 15

adult type diffuse glioma

Question 16

Answer 16

glioblastoma

Question 17

Answer 17

glioblastoma

Question 18

Answer 18

medulloblastoma

Question 19

Answer 19

pineoblastoma

Question 20

Answer 20

atypical teratoid rhabdoid tumor (AT/RT)

Question 21

Answer 21

pilocytic astrocytoma

Question 22

Answer 22

diffuse intrinsic pontine glioma