Trans 39 and 40 Radio Correlates must knows Flashcards
Unpaired midline single bones
Sphenoid, ethmoid, vomer, mandible
best way to examine the temporal bone?
CT scan
5 parts of the temporal bone?
squamous- thinnest mastoid - solid portion petrous - bony portion tympanic - styloid process
The anterior and posterior ethmoid sinuses are divided by middle turbinate bony support w/c is the
basal lamellae
preferred modality for sinuses
CT scan
boundaries of the nasal cavity
boundaries:
o anteriorly:anteriornares o laterally:nasalconchae
o superiorly:cribriformplate o inferiorly: hard palate
o posteriorly: posterior choanae
seen on radiographs as a radiolucent slit bec of the space formed by the true and false vocal cords
glottis
Initialscreeningofsinusitisorfacialtrauma
o Also used to exclude the presence of metallic foreign
bodies that might contraindicate MRI
radiography
Primary modality for evaluation of sinus infection and facial trauma
ct
Often sufficient to diagnosis of nonsurgical mass lesions
of visceral structures
ultrasound
Modality of choice for the evaluation of neoplastic lesions of the head and neck
mri
angled AP radiograph of the skull
• petrous part of the pyramids, the dorsum sellae and the
posterior clinoid processes
Usually used to check for the temporal bones because it offers a good view of your temporal canals, sphenoid, and sellar structures. You would know that it’s this view by seeing the temporal bones as a bat-like structure (red). Your sphenoid would be clearly seen, and this round structure (green arrow), would be your foramen magnum.
AP Axial View (Towne View)
caudally angled PA radiograph of the skull
• designed to better visualize the paranasal sinuses, especially
the frontal sinus
In this case, it is also used to view the orbits, because the
orbit and frontal sinuses are not overlapping. When the maxillary sinus and petrous ridge overlap, that’s this view.
• petrous ridges are below orbits
Caldwell View
angledPAradiographoftheskull,withthepatientgazing slightly upwards
o toassessforfacialfractures,aswellasforacutesinusitis o petrousridgesarebelowthemaxillarysinuses
a favorite view post trauma because it solves the problem of overlap between the orbits, maxillary sinus and the petrous ridge. The only problem would be you would lose visualization of your sella and foramen magnum. But it also gives the advantage of sometimes seeing your dens (odontoid process)
Waters View
nasal septum and the bony parts of the nose are seen better with this view, that’s why it’s a favorite for facial fractures. You may also see the odontoid process sometimes
waters view
back of patient arched as far as possible so that skull base is parallel to film
• primarily taken to demonstrate sphenoid sinuses and zygomatic arches
submentovertex view
is usually done with softer x-rays or less penetrating x-rays. Because sometimes, you want to see the relationship of the nasal bone with the soft tissues and cartilages of the nose.
Lateral Nasal View
zygoma, nose, and chin should touch the cassette
• optic foramen view
Special view for the optic foramen. Also called “three-point landing. Three-point meaning your zygoma, nose and chin should touch the film or the detector. But your eyebrow should be raised (not touching the detector).
Rhese view
oblique radiographic projection
used to demonstrate the petrous temporal bone, internal auditory and bony labyrinth
Stenvers view
if the glottic space would be obliterated that means?
edema of the vocal cords
Orbits are best seen in?
T2 MRI
Cornea and sclera appear * * *** on both T1 and T2 images
Hypointense
Lens appears———— on both T1 and T2 images
hypointense
Uveal tract appears hypo/hyperintense on T1 and hypo/hyperintense on
T2
hyper
hypo
Aqueous and vitreous humor are hypointense on T1 and hyperintense on T2 true or false.
true
tear drop sign and trap door fracture?
• Teardrop sign – orbital fat prolapses into the maxillary sinus
and may be joined by the inferior rectus muscle
• Trapdoor fracture – In children, the fracture may spring back
into place
Like a trapdoor on the floor, when you pull through it, it
closes back up. Sometimes even if you have opacified sinus, you might not see the bulge of the bone, especially in pediatric patients.
most common blow out fracture?
inferior blowout fracture
Second most common type, occurring through the lamina papyracea
• Orbital fat and the medial rectus muscle
• May prolapse into the ethmoid air cells
what blow out fracture?
medial blow out fx
