Which of the following is used to differentiate tumour recurrence and radiation necrosis?: (A) PET scan, (B) MRI, (C) 3D CT, (D) USG
Answer is A. ANSWER: (A) PET scanREF: Devita oncology 6th ed chapter 27PET may be used in therapeutic monitoring after chemotherapy or radiotherapy, with a classic indication being assessment for recurrent tumor versus radiation necrosis. Conventional imaging can not differentiate recurrent tumor from radiation necrosis