0:01

All right, so briefly we want to talk about

0:03

the MSK changes that we can see on MRI.

0:05

And this is not an MR enterography, although you

0:08

do need to keep your eyes out for these findings

0:13

manifestations of Crohn's and ulcerative colitis.

0:16

But this patient has bilateral changes adjacent

0:19

to their sacroiliac joints with a very dark

0:21

T2 appearance with relatively symmetric look.

0:25

I'm sorry, this is T1, and it's dark

0:27

on this T1 sequence in that region.

0:29

And then on the T2 weighted sequences,

0:32

it's also going to be very dark in that region.

0:35

And that corresponds to the

0:36

sclerosis that we typically see.

0:38

with sacroiliitis, and it is widely

0:42

apparent here on the CT scan.

0:44

So remember to look for that,

0:46

it's often symmetric.

0:47

It can involve the regions around the SI joints,

0:51

as well as you can see similar changes with a symmetric

0:54

appearance involving the spine with related sclerosis.

0:57

And another extraintestinal manifestation we need

1:01

to look for in the MSK system is avascular necrosis,

1:04

which can be related to the steroids and other

1:08

anti-inflammatories that these patients receive.

Sacroiliitis

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