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Given that it is a grade 2, I would advocate for more surgery and attempt gross total resection if possible and send for molecular genetics including NF2 and CKDN2. If the patient is adamant against surgery then yes I think radiation is appropriate

Here i don't think more surgery would be safe given involvement of the sinus and why residual left, but if they can resect then the principle is there to have a GTR and then go to 60 Gy in 30 to post op bed.
If not, and I suspect as much, given 5 months time to progression, then I would take the GTV and the surgical bed plus a 3 mm margin into brain tissue as CTV60/PTV60 (60 Gy in 30) then boost GTV residual +PTV with 6 Gy in 3 frx or 10 Gy in 5 frx depending what your comfortable with. Our data that will be presented and in submission suggests 66 in 33 or 70 Gy in 35 to result in better long term outcomes when residual vs 60 Gy in 30. I do sequential boost but you could SIB also. When volumes of residual are large I SIB otherwise I do the boost sequentially and a week or two gap using the Gamma Knife Icon. I would not single frx boost but fractionate the boost.

Thank you very much for your kind reply. As a matter of fact I don't tthink further surgery would be possibile. For the same reasons given by Arjun.
I also am pro sequential boost.