The Complementary Role of Ga-DOTATATE PET/CT in Diagnosis of Recurrent Meningioma.

Contrast-enhanced brain MRI is the choice of imaging modality in diagnosis and posttreatment evaluation, its role is limited in distinguishing recurrent lesion from postoperative change. Ga-DOTATATE is a somatostatin analog PET tracer which has high affinity to meningioma expressing somatostatin receptor. In this case series review, we described 8 patients with brain MRI suspected of recurrent meningioma who underwent focused Ga-DOTATATE PET/CT scan for radiation treatment planning. The combined brain MRI and PET/CT allowed improved conspicuity of the lesions and aided radiation treatment planning. The time from the initial surgery to PET/CT scans varied widely ranging from 1 year to 12 years. Three patients had PET/CT shortly after the initial surgery (1-3 years) and underwent targeted radiation therapy. Subsequent imaging showed no evidence of recurrence. Four patients had prolonged time between the PET/CT and the initial surgery (7-12 years) which showed extensive tumor burden. All four patients expired shortly after the last PET/CT scan. Ga-DOTATATE PET shows promising complementary role in detection and treatment planning of recurrent meningioma.