Brain 17 Vienna

Areas at Risk

1. Leptomeningeal space (subclinical disease / „low risk“)

2. Posterior fossa (subclinical disease „high risk“ ?) 3. Tumour site (residual tumour R1-2)

boostfield to posterior fossa

Mmmoving junction

SSD 100 cm

SSD 100 cm

tumour

rotation of collimator according to divergence angle of upper spinal field

isocentre

Spinal canal

SSD : source to skin distance