The doctors claimed that there has been no recorded medical literature on an eyebrow keyhole approach to remove an insular tumour and hence, this was a first-of-its-kind surgery. The doctors claimed that there has been no recorded medical literature on an eyebrow keyhole approach to remove an insular tumour and hence, this was a first-of-its-kind surgery. Chennai Health News, Wellbeing Tips, Diseases, Treatment and Nutrition | The Hindu