Fig. 7
From: Combined amino acid PET-MRI for identifying recurrence in post-treatment gliomas: together we grow
False positive diagnosis on PET: 34-year-old female diagnosed with anaplastic ODG 2 years back with enhancing lesion on MRI. PET image fused with axial T1 MPRAGE (A) shows an area of uptake along the parasagittal region of the left frontal lobe (large thick arrow) and another area (small thick arrow) along the margin of the resection cavity (linear white arrow) raising a suspicion of recurrence. There is no evidence of elevated perfusion on the rCBV map (B). Resection cavity is shown by white arrow. Peripheral diffusion restriction is seen along the margins of the lesion in the left centrum semiovale (block white arrow in C). There is no restriction along the resection cavity (black arrow). Peripheral enhancement is seen along the margins of the lesion in the left centrum semiovale (block white arrow in D) with no enhancement along the resection cavity (white arrow). One month follow-up axial post-contrast T1 MPRAGE (E) shows the resection cavity (thin white arrow) with complete resolution of enhancement in the left centrum semiovale (block white arrow) suggestive of treatment related changes excluding recurrence