My husband has recurrent glioblastoma (IV). He has had four surgeries and essentially is out of treatment options, both conventional and experimental. The original tumor communicates with the ventricles. He has developed what appears to be a one-sided sinus infection (left) with yellow and bloody mucous expelled when be blows his nose (first time this morning). He does not have a fever and says he does feel ill as one would with a cold or flu. THroughout his illness he has complained of sinus pressure and assumed it was allergy-related and took OTC allergy medication. He recently discontinued these drugs. Could the sinus drainage be related to his brain cancer?