Short-term postoperative surveillance imaging may be unnecessary in elderly patients with resected WHO Grade I meningiomas.

The optimal timing and frequency of postoperative imaging surveillance after a meningioma resection are not well-established. The low recurrence rates and slow growth of World Health Organization (WHO) Grade I meningiomas in particular have raised doubts about the utility of postoperative imaging surveillance. We sought to analyze the cost and utility of asymptomatic surveillance imaging in elderly patients after the resection of a WHO Grade I meningioma. We conducted a retrospective cohort study on 45 patients who had a primary WHO Grade I meningioma resected at our institution between 2001-2013 at or above the age of 60 with a minimum of 2 years of follow-up. All postoperative clinic notes were reviewed alongside imaging results to verify that patients were asymptomatic during the surveillance period. MRI and CT scan costs (all $USD) were estimated at $599.61 and $334.31 respectively based on the Centers for Medicare and Medicaid national averages. During an average follow-up period of 4.5 years, the average number of total imaging studies performed per asymptomatic patient was 3.58 with an average total cost of $2086.30 per patient. Forty-two (93%) patients had no new abnormal findings on any of their imaging. Three (7%) patients demonstrated either a new meningioma or progressive growth of the postoperative residual tumor on imaging. No asymptomatic patient underwent a reoperation. Our data suggest that elderly patients with resected WHO Grade I meningiomas are at low risk for recurrence and may not need asymptomatic surveillance imaging for the first several postoperative years.