CT/MRI fusion at the time of radiotherapy planning is showing large residual disease in case 4. Entire T2 signal abnormality on MRI along with post-operative cavity was included in GTV. A margin of 2 cm was given to GTV to create CTV. Further a margin of 0.5 cm was given to CTV to create planning target volume. CT, computed tomography; MRI, magnetic resonance imaging; GTV, gross tumor volume; CTV, clinical target volume.