0:00

So we may be getting a little frustrated

0:02

because we can't make histologic diagnoses

0:05

on most of these sinonasal cancers.

0:07

One of the lesions that has a typical location and a

0:11

somewhat typical imaging features is the

0:15

esthesioneuroblastoma or the olfactory neuroblastoma.

0:18

This is a lesion that occurs in the high nasal

0:21

cavity, along the olfactory cleft, and therefore

0:24

has a predilection for growing intracranially.

0:27

This is a CT scan showing an esthesioneuroblastoma.

0:31

This is another CT scan showing one of the features

0:34

that might suggest this diagnosis, speckled

0:37

calcification in the skull base portion of this

0:41

esthesioneuroblastoma. From the upper

0:44

nasal cavity, it may grow intracranially,

0:47

and when it grows intracranial, you may

0:49

see cystic areas associated with it.

0:51

For example, in this case, we see

0:54

the involvement of the nasal cavity.

0:56

We see the growth intracranially, but we

0:59

also see associated cysts that are at the

1:02

periphery of the top of the cancer as it

1:06

interfaces with the intracranial contents.

1:10

This peripheral cystic area in a tumor that is

1:10

26 00:01:15,105 --> 00:01:19,635 centered on the olfactory cleft region and upper

1:19

nasal cavity, showing contrast enhancements,

1:22

still being dark on a T2-weighted scan,

1:26

would be characteristic of an olfactory neuroblastoma.

1:29

This is a different case of

1:31

an olfactory neuroblastoma.

1:32

Again, growth through the cribriform plate, along

1:36

the crista galli from the upper nasal cavity.

1:39

In this case, no cyst associated, dark

1:42

in signal intensity in T2-weighted scan.

1:44

Again, features that would be characteristic

1:47

of an olfactory neuroblastoma.