How to read a sinus CT Flashcards Preview

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Flashcards in How to read a sinus CT Deck (15):
1

The standard radiographic study for evaluation of sinus disease is the sinus CT scan performed in the coronal plane (with/without) contrast

WITHOUT

2

What are 4 radiographic densities ?

Air
Bone
Water
fat

3

What 3 things do you always have to look at on radiographic studies?

1. name
2. date
3. orientation

4

What is the order in which you should evaluate a sinus CT?

Orbits, orbit walls, skull base, maxillary alveolus, nasal septum, and sinuses

5

3 common anatomic variants on coronal CT scans of sinuses

1. deviated nasal septum
2. asymmetry of sinuses (size, shape, septas)
3. air cell w/in middle turbinate (concha bullosa)

6

What is the most significant area to examine in a patient with sinus complaints?

coronal view of the osteomeatal complex (OMC)

7

What is the osteomeatal complex?

region through which the maxillary, ethmoid, and frontal sinuses drain in the nose

8

obstruction of the OMC will frequently lead to ___, and is often due to mucosal edema or anatomic abnormalities

sinusitis

9

The anterior-most ethmoid sinus called ____ is freq clouded and may be associated with obstruction of the nasal frontal duct and results in ____ sinusitis

agger nasi cell
frontal sinusitis

10

Sinusitis is manifested by loss of aeration of (one/multiple) sinus(es)

Multiple

11

Clouding of a single sinus suggests what?

Tumor - commonly inverting papilloma (benign growth caused by HPV)

12

When do you get a sinus CT?

Medical therapy has failed or there is concern for neoplasm (eg unilateral)

13

All patients with ____ have chronic sinusitis, typically involving all sinuses

nasal polyposis

14

Mucosal thicking of which sinuses typically occur after a URI? How long does it persist?

Ethmoid
6-8 wks

15

When should CT scans be obtained? Why is timing important?

After pt has been maximally treated bc the general pop has a high incidence of mucosal thickening - hard to differentiate bw sinus clouding due to common cold vs bacterial sinusitis