What were her symptoms that led to a blasto diagnosis?
If there were lumps or lesions, they could be biopsied? Sounds like coughing, you say, so maybe the xrays resulted in the diagnosis? I guess I would personally want another blasto antigen test before considering discontinuation of meds. Also, checks for other fungal infections (which itra also works on).
Comet was on itra rather than fluconazole even though his right eye was the chief presenting symptom and his lungs were not involved. Fluconazole penetrates eye and brain barriers better than itra but itra treats the whole body better. When he was diagnosed, his retina was 100% detached, vision was gone with almost no hope, his ocular pressure was off the charts, and he suffered from secondary glaucoma. His eye was also the size of a golf ball, sore, inflamed, and raw looking. We were treating with numerous eye drops, including steroids, to reduce inflamation, reduce pressure behind the eye, and also to reduce tear creation also to try to manage ocular pressure. None of it worked, and his eye ruptured resulting in emergency surgery to remove his eye. The vet would have prefered to remove the eye immediately but we needed to try to save it -- even if it was blind. Maybe the fluconazole would have worked better on Comet. Then again, 10 dogs presented in the two week period before Comet's diagnosis, and all but Comet died ... so I feel very lucky to have my boy.
I just hope this latest trouble is not a relapse. The relapse rate is high -- approaching 30% and may be higher in dogs with ocular involvement or testes involvement. I have not read statistics as to whether removal of the blind eye reduces the chances of relapse. The one statistic that I cling to, always, is that dogs that beat it once ... beat it again.