Dear Patient: You have to consult the neurosurgeon for this. He will decide the further course. He probably will re-operate on the same.
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If there is residual disease after trans sphenoidal Surgery ( through nose) then patient should receive post operative Radiotherapy. even if there is complete removal of pitutary tumor but if it was a secretory pitutary adenoma then also patient should receive post operative adjuvant radiotherapy.
The most appropriate dose will be 45Gy/25# over 5 weeks.
and don't worry radiotherapy for pitutary adenoma is very safe without any major toxicity.
Please consult a radiation oncologist.