Hypothalamus pituitary imaging

Question 1

1. Describe the basic principles of MRI that apply to pituitary imaging.

Answer 1

1

Question 2

2. Identify the anatomic structures visualized in an MRI of the sellar and parasellar regions.

Answer 2

Anterior Pituitary Gland: 
	Enhances (no BBB),  Low T2  signal
	Secretes: Prolactin, GH, ACTH, LH, FSH, TSH
Intermediate (Septum) 
	Usually slightly brighter  on T2
Posterior Pituitary Gland 
	Sometimes bright on T1,  does not  fat  saturate
	   Secretes: Oxytocin, Vasopressin

Question 3

3. Recognize the variable appearance of lesions in the sellar and parasellar regions.

Answer 3

1

Question 4

meningiomas

Answer 4

dense solid narrow vessesl
adenomas do not narrow vessels
hard to remove eventhough they are benign

Question 5

adenomas

Answer 5

enhance less

Question 6

adenoma size

Answer 6

microadenoma 1cm

Question 7

rathke cleft cyst

Answer 7

increase signal on T1 and T2

Question 8

lymphcytic hyphocytisis-

Answer 8

infundibulum too large

Question 9

hamartoma

Answer 9

doesnt enhance with contrast