Discriminatorrad

Front 1

fibrous dysplasia vs pagets

Back 1

fd: no thickening of cotex

pagets: cortical thickening

Front 2

psoriatic arthritis vs ra

Back 2

psoriatic has bone prolifertaion

Front 3

enchondroma vs chondrosarcoma

Back 3

pain

Front 4

avn vs infarct

Back 4

avn occurs at articular surface
infarct occurs away from articular surface
there are 2 types of osteonecrosis: avn and infarct.

Front 5

osteopetrosis vs engelmann's

Back 5

Engelmann’s: affects only diaphysis of tubular bone (in contrast, osteopetrosis affects the entire bone)

Front 6

osteomalacia vs osteoporosis

Back 6

looser's zones
cortical stress fx filled with poorly mineralized osteiod

Front 7

gaucher vs niemann-pick

Back 7

avn and cystic bone disese does not occur in niemann-pick

Front 8

renal scarring vs fetal lobulation

Back 8

indentations of cortex overly the calyces in scarring. in lobulation the indentations are between the calyces.

Front 9

lymphoma vs toxo

Back 9

thallium-201 spect is taken up by lymphoma
FDG Pet is taken up by lymphoma
Toxo has increased DWI then Lymphoma
Toxo has ADC > 1.6

Front 10

central neurocytoma vs subependymoma

Back 10

central neurocytomas enhance (vascular)
subependymomas do not enhance

Front 11

medulloblastoma vs ependymoma

Back 11

medulloblastoma do not have a tongue into the 4th ventr outflow tract, spread by csf 30% (image spine), compress 4th ventricle.

ependymoma has a tongue extending into the 4th ventr outflow tract and expands the 4th ventr.

Front 12

fibrous dysplasia vs pagets

Back 12

fd involves facial bones and does not cause cortical thickening.

Front 13

schizencephalic cyst vs porencephalic cyst

Back 13

schiz is lined by gray matter. porencephalic cyst is lined by white matter.

Front 14

subependymal heterotopia vs subependymal nodules in ts

Back 14

subependymal heterotopia follos gray matter signal

Front 15

hemangioblastoma vs jpa

Back 15

age
jpa in kids
hemangioblastomas occur in adults

Front 16

pituitary macroadenomas vs meningiomas

Back 16

adenomas may encase the cavernous internal carotid and do not narrow the vessel.
meningioma will narrow the vessel.

Front 17

recurrent tumor vs radiation necrosis

Back 17

recurrent tumor is pet avid and has increased cbv when compared to radiation necrosis

Front 18

hamartoma of hypothalamus vs hypothalamic glioma

Back 18

hamartoma should not grow

Front 19

chordoma vs chondrosarcoma

Back 19

chordoma is midline (may cause 6th nerve palsy)

Front 20

dandy-walker vs cerebellar hyoplasia

Back 20

dw retrocerebellar cyst communicates with the 4th ventr

Front 21

canavan vs alexander

Back 21

alexander internal capsule is involved. elevated naa.

Front 22

rhomboencephalpsynapsis vs joubert's

Back 22

cereballar hemisphere's are OPPOSED not fused in Joubert's

Front 23

congenital os odontoideum and old odontoid fx

Back 23

os usually has assoc. hypoplasia of the dens, a wide gap btween the dens and the ossicle, and hypertrophy of the anterior arch

Front 24

neuropathic arthropathy vs diskitis/osteomyelitis

Back 24

neuropathic arthropathy
1 joint below fusion
disorganization
debris
vacuum phenomenon
facet involvement
sponylolisthesis
T1 vertebral body diffuse bright
diffuse enhacement post contrast

diskitis/osteo is more focal

Front 25

diastematomyelia vs diplomyelia

Back 25

diastematomyelia
gray matter of each hemicordforms a single dorsal and ventral horn giving rise to a to an ipsilateral dorsal and ventral root.

diplomyelia
two separte cords.

Front 26

bilateral vs unilateral facet dislocation

Back 26

>50% anter sublux or translation of the vertebral bosy above the ruptured disc relative to the vert body below the disc is c/w b/l facet dislocation.

<50% favors unilateral

Front 27

mets vs diskitis/osteo

Back 27

involvement of pedicles

sparing disks

favors mets

Front 28

benign vs malignant fx

Back 28

bx
f/u MRI in 6 weeks

benign:
fx line on T2 or post T1
fluid sign
intravertebral cleft
absence of soft tissue mass
lack of pedicle involvement
solitary vertebral body

Front 29

schwannoma vs neurofibroma

Back 29

neurofibroma higher rate of malignant degeneration. target sign on T2.
schwannoma higher rate of bleeding

Front 30

schwannoma vs meningioma

Back 30

ct- looking for calcification a/w meningiomas

Front 31

erb-duchenne vs dejerne-klumpke paralysis

Back 31

e-d: C5/6 avulsion injury
d-l: C7/T1 avulsion injury

Front 32

ependymoma vs astrocytoma

Back 32

ependymomas enhance more

Front 33

sma syndrome vs nutcracker syndrome

Back 33

sma is compressing duodenum
nutcracker is compressing left renal v.

Front 34

Dermoids vs Lipoma

Back 34

The detection of either flow voids or cranial nerves helps to distinguish a lipoma from a dermoid, which does not contain these structures. Unlike dermoids, lipomas do not rupture and therefore patients with lipomas are not at risk for chemical meningitis.

Front 35

medulloblastoma vs astrocytoma

Back 35

C- medulloblastome is hyperdense

Front 36

arachnoiditis vs tumor

Back 36

arachnoiditis does not enhance as much as tumor, tends to be smooth and symmetric,

Front 37

benign vs malignant testicular tumor

Back 37

malignant is usually painless

Front 38

hodgkins lymphoma vs nhl

Back 38

Hodgkin lymphoma (HL) commonly involves contiguous nodal groups and the spleen, whereas extranodal involvement is more common in NHL.
HL is more common than NHL in the pediatric population. However, NHL is more common than HL in children less than 10 years old. Lymphoma is the most common mediastinal mass in teenagers. HL usually involves continuous nodal groups, whereas NHL is commonly extranodal.

Front 39

Osteoid Osteoma vs Osteoblastoma

Back 39

The typical radiological appearance as well as the histopathology of osteoblastoma are very similar to osteoid osteoma. Typically, size is used as a discriminator between the smaller osteoid osteoma and the larger osteoblastoma with a threshold measurement of approximately 1.5 cm. The degree of reported pain with osteoblastoma is typically not as intense as with osteoid osteoma.