0:00

<v ->Now, among the epiphyseal lesions,

0:02

a long list of possibilities.

0:06

We've talked a bit about clear cell chondrosarcoma.

0:09

You've seen some giant cell tumors.

0:12

We're gonna talk about

0:13

some of these other conditions tomorrow,

0:16

but atop the list, chondroblastoma.

0:19

It's a cartilage lesion in the immature skeleton.

0:23

The knee is a common site of involvement.

0:25

And what's interesting about this particular lesion,

0:28

it does funny things.

0:30

For example, it is associated with marrow edema.

0:33

Even though it's a benign lesion,

0:35

you will get extensive marrow edema.

0:38

You also will get periosteal reaction.

0:42

All right.

0:43

And then the third component is joint involvement

0:46

with synovial proliferation and a joint effusion.

0:50

This is an old case showing you a chondroblastoma,

0:53

the proximal tibia with a joint effusion.

0:57

Here's a more recent case showing your chondroblastoma

1:01

and epiphyseal lesion involving the proximal humerus.

1:05

Again with synovial proliferation and a joint effusion

1:09

and marrow edema associated with it.