Transcript Mandible

Sella Turcica series is largely obsolete!

If film readout is negative, could be diagnostic
x-ray not sensitive enough to detect problem need an MRI or CT

If positive, patient sent to CT or MRI for more
detailed evaluation anyway

(CT for bone, MRI for soft tissue)
Where is the Sella Turcica?
1 Sphenoid
bone
Sella Turcica - lateral view

Superior
surface of
Sphenoid

hypophysis
= pituitary
gland
Literally means “Turkish Saddle”
Camel Toes
Sella Turcica- floor of cranium view
Pituitary Gland sits inside Sella Turcica
Once
thought to be
master gland- itself
is regulated by
hormones from
hypothalamus
Controls
release of
hormones to thyroid,
gonads, adrenal
cortex (growth,
maturation, reproduction)
Results of Pituitary tumors
Giantism
Pituitary gland releases
growth hormone
uncontrollably
Died at age 22
from
complications of
heel blister
Robert Wadlow 8’ 11’’
Shoe salesman
Sandy Allen
7 feet 7 ¼
inches Tall
Dwarfism
More than 200 different kinds
 Pituitary gland just one cause of many
 Pituitary gland deficient output growth
hormone due to genetics or brain injury


Defined as adult under 4 feet 10 inches tall
(?)
Sella Turcica
Projections
PA
axial
Lateral
PA Axial - SellaTurcica
Head
and
nose rest on IR
( like Skull)
CR 10
degrees
cephalic
CR exits at
Glabella
Collimate to
4” X4”
PA Axial - Sella Turcica
Imae
Evaluation Criteria - PA Axial Sella X-ray



No rotation of cranium
Symmetric petrous
ridges
Close beam
restriction!
Lateral Sella Turcica
A
Anterior
Clinoids
B
Posterior
Clinoids
C
Dorsum
D
Hypophysis
(pituitary)
E
Sphenoid
sinus
Sellae
Sella Turcica -Lateral
Mid-sagittal
plane is
parallel with plane of
IR
IPL is perpendicular
to IR
IOML is parallel with
transverse axis of film
i.e.--same
as Lateral
skull and sinus and
facial bones!
Sella Turcica -lateral
cont’d
Upright
or semiprone (crosstable)
8X10 cassette
CR perpendicular to
IR 3/4”anterior,
3/4” superior to
EAM
Collimate to
about 4” by 4”
Evaluation Criteria - Sella Turcica
Sella
in center of
film
Sella
Turcica not
rotated
Anterior clinoids
superimposed
Posterior
clinoids
superimposed
Close
beam
restriction
The End!