SBRT2015

Dosimetric gain (if any) is mostly for 3D CRT (i.e. 4-field box)

Irritation of the anal canal (hemorroids) Cho KJMS 2009

Complex procedure: may require frequent adjustments to avoid systematic

errors or deformations (Jones Med Phys 2012, Miralbell IJROBP 2010)

Increases treatment time

Conclusion: mixed experiences, complex and invasive procedure,

questionable benefits

Rectal balloons disadvantages

Management of intrafraction motion