0:00

So what are retroperitoneal lesions

0:03

and how do they appear?

0:04

They may appear as cystic Foci,

0:07

which may be non-neoplastic or neoplastic

0:10

and nature those that are neoplastic could

0:13

be primary malignancies or metastases in

0:16

similar fashion. We have solid retroperitoneal lesions

0:19

that may be neoplastic or

0:22

non neoplastic a nation and in similar

0:25

fashion those that are neoplastic could be primary or

0:28

secondary in nature.

0:31

So when it comes to statistic lesions of the Retro peritoneum, so

0:34

the cystic RP masses are relatively uncommon and

0:37

they're actually less likely than solid lesions

0:40

to be neoplastic in nature.

0:42

So when we think about examples of these neoplasms in the

0:45

retroperitoneal anatomic compartment, we're thinking

0:48

about teratomas mucinous asadenomas. And

0:51

when we think of the non neoplastic examples, these would

0:54

be the malarian cysts pancreatic pseudosis post

0:57

pancreatitis collections, uranomas hematomas,

1:00

and of course hepodomoysis.

1:03

When we think about solid lesions, we're thinking about again

1:06

the neoplastic and non-neoplastic regions.

1:09

So when we think about solid lesions of the ratchet, peritoneum

1:13

These are more likely than cystic lesions

1:16

to be neoplastic.

1:18

So the neoplastic examples that we think about are going to be sarcomas. They're

1:22

going to be the neurogenic tumors just the paragangliomas.

1:26

You're gonna be the germ cell tumors immature teratomas

1:29

is in this category as well.

1:31

Of course, there's Mets and Lymphoma.

1:34

Here we see to the right in the CT image. We see a suspected

1:37

or RP sarcoma. Just north of the

1:40

right, kidney.

1:42

When we think about the non-neoplasty examples, we're thinking about

1:45

retropertial fibrosis extra medullary

1:48

amount of pieces things like castleman's disease

1:51

and gesture disease.

1:53

So what about the cystic lesions of the omentum the

1:56

messenger in the peritoneum?

1:58

So cystic lesions within the momentum the mesentery in

2:01

the peritoneum actually carry a lesser recip malignancy and solid

2:04

lesions. So in terms of non neoplast examples these

2:07

include duplication cysts lymphocyles lymphangiomas

2:10

and pancreatic pseudosis. When

2:13

we think about the neoplastic examples, we're thinking what's

2:16

cystic mesothelioma cystic spindle cell tumors,

2:19

of course my sarcoma being one of them and

2:22

stick teratomas.

2:24

So we've established that some lesions of

2:27

the insurance abdominal connective tissues have a higher likelihood of

2:30

neoplasm, but it's important to distinguish whether these are

2:33

primary which are particularly rare or secondary lesions,

2:36

which can occur secondary to metastasis or direct

2:39

Invasion from other malignancies Regional to

2:42

that location.

2:44

So these neoplastic examples include the GI stromal

2:47

tumors the commonly referred to as just the

2:50

carcinoid tumors lymphoma liposarcomas

2:53

and Des Moines tumors.

2:56

When we think about the non-neoplasty examples, this includes

2:59

the wispy sclerosing mesenteritis lymphatinopathy

3:02

that could occur in the setting of

3:05

infection or inflammation.

3:08

So in some areas of the world, which of the following is

3:11

the most common source of peritoneal implants.

3:14

berylliosis tuberculosis silicosis

3:17

or aspergillosis

3:21

if you considered tuberculosis, then you would be correct.

3:25

We'll peritoneal implants secondary to mycobacterium tuberculosis

3:28

that are actually common infectious causes

3:31

of peritoneal implants in some regions of the world particularly retuberculosis

3:34

remains endemic and here we see a thickening

3:37

of the peritoneal lining with some nodules or

3:40

implants rather in this image

3:43

and the right