“…Residual tumor on the temporal lobe was expected with an endoscopic endonasal approach, considering the limitations of endoscopic endonasal visualization beyond the immediate suprasellar region into the temporal fossa. Given the final pathologic diagnosis demonstrated a benign, WHO I pituitary adenoma with a low Ki-67 index <2%, we chose to monitor the residual tumor with surveillance imaging, rather than pursue further surgery via a transcranial approach, which has been described as a primary or staged approach for complex, giant pituitary macroadenomas in patients, typically with pre-existing visual and/or hormonal deficits ( 10 – 12 ). Surveillance imaging of our patient has not revealed tumor growth, but if this were to occur, we would pursue stereotactic radiosurgery as the least invasive option to the patient, a strategy that has previously been reported to result in durable local tumor control ( 13 ), prior to considering further options such as a second surgery via an open approach.…”