Oh i'm here and researching and have not found this to be a normal discharge from any cases i've been reading unless there is an underlying condition which should have been tested for before instillation. A possibility
Pyuria refers to urine which contains pus. Defined as the presence of 4 or more neutrophils per high power field of unspun, voided mid-stream urine. It can be sign of a bacterial urinary tract infection. Pyuria may be present in the septic patient, or in an older patient with pneumonia.
Its not a normal process and samples should be taken of the urine and blood to see whats actually going on and of course your uro will say you read too much.
I would write Dr. Lamm who is very good at a quick response
www.bcgoncology.com/drlamm/askdrlamm.html
I'm stumped........
Pat