0:01

Hello everyone.

0:02

Dr. Sidney Levy here.

0:04

I would like to continue our discussion of the

0:06

anatomy of the sinonasal cavity, using our case

0:12

example here, which includes a large right sinonasal

0:17

squamous cell carcinoma, but the left side has

0:20

anatomy preserved and serves as a good comparison.

0:23

So, what are the subsites of the sinonasal cavity?

0:28

Firstly, let's start off with the nasal cavity itself.

0:31

So in the axial projection, we have the

0:35

mucosa covering the nasal septum,

0:38

and then the lateral wall of the nasal cavity.

0:41

In the coronal projection, and not well seen in

0:45

the sagittal projection in this particular slice.

0:48

So that's the nasal cavity.

0:51

The maxillary sinus,

0:55

and not well seen in the sagittal.

0:58

The ethmoidal air cells.

1:00

The sphenoidal sinus.

1:03

and the frontal sinus.

1:05

So as you can see from my drawings, you need to be able

1:09

to look at this region in all three projections because

1:14

you will only see one or two subsites at any one time.

1:19

Some general comments, the nasal

1:21

cavity consists of a septum, a floor,

1:24

a lateral wall and the edge of the nares.

1:28

The maxillary sinus is the most commonly

1:31

involved subsite for malignancy.

1:33

It is helpful to divide the maxillary sinus into

1:37

an anteroinferior portion, or infrastructure,

1:41

and a posterosuperior portion, or superstructure.

1:46

And the reason for this is that, uh, anteroinferior

1:50

tumors tend to have a good prognosis, whereas

1:53

posterosuperior tumors tend to have a poor prognosis.

Sinonasal Cavity Anatomy: Subsites

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0:01

Hello everyone.

0:02

Dr. Sidney Levy here.

0:04

I would like to continue our discussion of the

0:06

anatomy of the sinonasal cavity, using our case

0:12

example here, which includes a large right sinonasal

0:17

squamous cell carcinoma, but the left side has

0:20

anatomy preserved and serves as a good comparison.

0:23

So, what are the subsites of the sinonasal cavity?

0:28

Firstly, let's start off with the nasal cavity itself.

0:31

So in the axial projection, we have the

0:35

mucosa covering the nasal septum,

0:38

and then the lateral wall of the nasal cavity.

0:41

In the coronal projection, and not well seen in

0:45

the sagittal projection in this particular slice.

0:48

So that's the nasal cavity.

0:51

The maxillary sinus,

0:55

and not well seen in the sagittal.

0:58

The ethmoidal air cells.

1:00

The sphenoidal sinus.

1:03

and the frontal sinus.

1:05

So as you can see from my drawings, you need to be able

1:09

to look at this region in all three projections because

1:14

you will only see one or two subsites at any one time.

1:19

Some general comments, the nasal

1:21

cavity consists of a septum, a floor,

1:24

a lateral wall and the edge of the nares.

1:28

The maxillary sinus is the most commonly

1:31

involved subsite for malignancy.

1:33

It is helpful to divide the maxillary sinus into

1:37

an anteroinferior portion, or infrastructure,

1:41

and a posterosuperior portion, or superstructure.

1:46

And the reason for this is that, uh, anteroinferior

1:50

tumors tend to have a good prognosis, whereas

1:53

posterosuperior tumors tend to have a poor prognosis.

Report

Description

Faculty

Sidney Levy, PhD, MBBS

Radiologist and Nuclear Medicine Specialist

I-MED

Lesson

Oral Cavity Anatomy

Lesson

Oral Cavity Staging of Squamous Cell Malignancy

Lesson

Lymph Node Levels of the Neck

Lesson

Oropharynx

Lesson

Hypopharynx

Lesson

Larynx

Lesson

Sinonasal

Lesson

Perineural Tumor Spread

Sinonasal Cavity Anatomy: Subsites