A second clinical opinion (Rene Gandolfi in Castro Valley, CA) confirmed the
very probable diagnosis of adrenal tumor, and suggested we operate soon.
Today, Hannah (2 y/o) had her right adrenal removed, which contained a large
tumor.  She did fine, and everything is good except my wallet ($800+).
Gandolfi seems a very good vet, and I recommend him.  His staff is very
thorough, and his knowledge of weasel medicine seems quite extensive.
 
Thanks to all of you that offered advice.
[Posted in FML issue 1301]