Anatomy, radiology

Question 1

Blood supply to tonsils

Answer 1

Lingual artery->dorsal lingual artery
Ascending palatine
Facial-> tonsillar branch of facial artery
Ascending pharyngeal
Lesser palatine

Question 2

MRI appearance of a cholesterol granuloma

Answer 2

Bright on T1 and T2

Cystic with evidence of bony erosion

Question 3

MRI appearance of a VS

Answer 3

T1 (pre G): Isointense
T1 (post G): Avid enhancement
T2: Hyperintense
Other: No dural tails, obtuse angles in cistern

Question 4

MRI appearance of a meningioma

Answer 4

T1 (pre G): Isointense
T1 (post G): Enhancement (usually less compared to VS)
T2: Variable
Other: Dural tails, acute angles in cistern

Question 5

MRI appearance of an arachnoid cyst

Answer 5

T1 (pre G): Isointense to CSF
T1 (post G): No enhancement
T2: Isointense to CSF
Other: Same appearance as CSF, well circumscribed

Question 6

MRI appearance of an epidermoid

Answer 6

T1 (pre G): Isointense to CSF
T1 (post G): Possible thin rim of enhancement
T2: Isointense to CSF
Other: Heterogenous hyperintensity on FLAIR, diffusion restriction on DWI

Question 7

MRI appearance of a lipoma

Answer 7

T1 (pre G): Hyperintense
T1 (post G): No enhancement
T2: Hypointense
Other: Fat suppression sequencing

Question 8

Contents of cavernous sinus

Answer 8

III, IV, V1, V2, VI and the internal carotid

Question 9

Contents of the orbital apex

Answer 9

II, III, V1, VI and ophthalmic artery

Question 10

Contents of the superior orbital fissure

Answer 10

III, IV, V1, VI and superior ophthalmic vein

Question 11

Imaging for MOE

Answer 11

CT: Skull base erosion in 50% of subjects
MRI: Inflammatory disease in area
Technetium: Once positive, always positive. Examines osteogenic activity
Gallium: Granulocyte binding. Good for following disease

Question 12

MRI of a cholesteatoma

Answer 12

T1 (pre G): Hypointense
T1 (post G): No enhancement
T2: Hyperintense