Q-7. Radiation induced necrosis can be diagnosed by (AIIMS NOV 209)
a) PET
b) CT
c) MRI
d) Biopsy
Answer: PET
Explanation:
PET and SPECT have ancillary roles in the imaging of the brain tumors, primarily in distinguishing tumor recurrence from tissue necrosis that can occur after radiation.
Biopsy is frequently required to establish the correct diagnosis.
Important points:
PET and SPECT may demonstrate that glucose metabolism is increased in tumor but decreased in radiation necrosis.