Erratum to: Acta Neurochir

DOI 10.1007/s00701-016-3019-6

The correct figure 1 legend should be the below:

Fig. 1
figure 1

2006: T1 + GAD coronal MRI (a), T1 + GAD axial MRI (b) and axial flair MRI (c) measuring 2.6 × 2.3 cm. 2009: T1 + GAD coronal MRI (d), T1 + GAD axial MRI (e) and axial flair MRI (f) measuring 2.0 × 1.6 cm. 2016: T1 + GAD coronal MRI (g), T1 + GAD axial MRI (h) and axial flair MRI (i) measuring 1.8 × 1.6 cm