For a glioblastoma patient who had an MRI immediately postoperatively and you are able to repeat one closer to the time of CT simulation, do you use the more recent scan or the immediate postoperative scan for contouring (T2/FLAIR and T1 post)?

Is it necessary to repeat MRI a certain amount of time after surgical resection prior to starting radiation?

Answer from: Radiation Oncologist at Academic Institution

We usually obtain a repeat MRI closer to the time of CT sim, ideally on the day of sim, for several reasons. First, surgical cavities have a tendency to collapse which may impact target volume delineation. Secondly, peritumoral edema T2FLAIR signal infrequently subsides, which may also affect target...

Comments

Radiation Oncologist at Turville Bay MRI & Radiation Oncology Center
I agree with Dr. @Lazarev. A small study from Tho...

Radiation Oncologist at Mallory Radiotherapy, PLLC
It can definitely happen. I have seen the tumor gr...

Radiation Oncologist at Lafayette Radiation Center
Always re-image. Why not?

Radiation Oncologist at University of Washington School of Medicine
I always reimage particularly because I expand onl...

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For a glioblastoma patient who had an MRI immediately postoperatively and you are able to repeat one closer to the time of CT simulation, do you use the more recent scan or the immediate postoperative scan for contouring (T2/FLAIR and T1 post)?

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