Brain Cysts

Hi my husband recently had a resection of a grade 4 brian tumor.  They were able to get about 98% of the tumor, the 2% was laying on the motor cordex, so it was not a good option to remove all.  Now, 4 weeks later and in therapy, my husband started getting headaches behind his eyes, and seizures appeared.  The CT and MRI showed a cyst.  We were told that it was a cyst probably developed from the tumor giving signals, but it was not surgical and would hopefully disappear with steriods.  Now, they have added 600 mg of seizures meds called delantin and steriods and my husband is so sleepy he fell a sleep while he is walking in therapy.  The rehab doctors just said well maybe this is the best we can expect.  I told them to try something different change meds to see if the seizure meds were the problem.  But, my question today sorry so lengthy but is its common to develop a cyst in the area of a removed brian tumor and how dangerous is this?
Thank you for your help.

[rumpled]

I am very sorry to hear about the complication. I will try to search around for information for you.
I would ask the original operating physician if he can suggest another medication, but in some ways, sleep is healing and hopefully he is just doing that for now.

[SandyPie]

Thank you very much.  Your advise is good, I did get an appt today with the surgeon.  It seems from his perpective.  It could be sleep anea, meds, or the cyst.  He could put a drain in the cyst and it would have to be drained every now and then.  But, he wants to try meds first.  Good plan.  I pray this will help and I agree with you too sleep is the healing agent.
Thank you