When I read earlier that the aspirate was blood, I had a feeling this would be the outcome. But, I'm praying that, if it is cancer, Monty has the same cancer that Foxy had. Our vet found round cells in the aspirate, and we opted to have the tumor removed rather than sending in the fluid. Her final diagnosis was hemangiopericytoma. Treatable, rarely metastesizes, Foxy lived 4 years after her's was removed.