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Richard,
I asked my boss, the Alaska state vet, and got the following.
It appears to be a granuloma.  It would have been caused by
long-term irritation of some sort, probably of the
peritoneal lining.  The lack of structure is definitely
consistent with this diagnosis.  The source of irritation
could be chemical, biological, or physical.
Hope this helps
Howard Teas
Alaska Dept Environmental Conservation

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