11-08-2017, 10:27 PM
Join Date: Feb 2015
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Did you ask your vet what the 'negative' result means? We do cytologies all the time and I have yet to have a 'negative' for an answer. We may get 'inconclusive', or possible lipoma, or no sign of neoplasia, or at least something that describes what the lab sees (total lack of cells sometimes if we sent in a poor sample for example)... but 'negative' is not really a possible description of a cytology sample... negative for what? Doesn't make any sense... particularly with that huge, inflamed mass on your dog's chin.
Quite impressive. I think a biopsy is in order, particularly if it is continuing to grow- you putting any ointment on it? If so, and it's still growing, I would remove it ASAP.. I can guarantee if you send in a biopsy of your mass, you will not have a 'negative' for a description of the it (that would be even more meaningless).
Several things that come to mind... histiocytoma, ring worm carion (a skin fungus), infected lump of skin (bacterial)... but there are hundreds of possibilities really.