Thallium-201 single-photon emission computed tomography imaging in a pediatric brain tumor. A case report.

Thallium brain single-photon emission computed tomography (SPECT) may be useful for differentiation of tumor recurrence from scar tissue and radiation necrosis and to predict low or high grade brain tumors. We report a case of an 11-year-old boy with recurrent oligodendroglioma who showed increased focal uptake of thallium-201 at the site of recurrence after surgery and radiotherapy on a SPECT imaging of the brain. This indicates viable tumor mass as opposed to radiation necrosis.