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<v ->Now we come to that synovial chondrosarcoma,

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as I say, this is a rare tumor,

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reported in some cases as a complication

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of primary synovial chondromatosis,

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I think this figure of 5% is high,

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but that you can find in some of the literature.

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Seen in the knee and hip more than in other cases.

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And as I'll show you, it looks a little bit more bizarre

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than simply a synovial chondromatosis.

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It can be associated with distant metastasis.

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So here's one example, it's an old case,

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and you look at the plain film

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and there's no way I would call that synovial chondromatosis

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or osteochondromatosis because it looks so bizarre,

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it's so mass-like, it's so irregular,

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it's a calcification, and ossification,

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and this is an old MR spin echo technique,

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but clearly inhomogeneous areas of high and low signal.

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So that's an example of what it might look like.

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And here again, this one sent to me

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by one of our previous visiting scholars,

1:14

is a synovial chondrosarcoma

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again in the temporomandibular joint.

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And that's why I now think of synovial osteochondromatosis

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and synovial chondrosarcomas occurring in this location.

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This one you could diagnose as synovial osteochondromatosis,

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it doesn't look quite as aggressive,

1:39

but histologically this was a chondrosarcoma.