[Value of 18F-FDG and 11C-MET PET-CT in differentiation of brain ringlike-enhanced neoplastic and non-neoplastic lesions on MRI imaging].
OBJECTIVE
To evaluate the value of (18)F-FDG and (11)C-MET PET-CT scan in differentiation of brain ringlike-enhanced lesions on MRI imaging.


METHODS
Forty-one brain ringlike-enhanced lesions on MRI imaging including 30 brain tumors and 11 non-neoplastic lesions confirmed pathologically or clinically underwent (18)F-FDG and (11)C-MET PET-CT brain scan. Among them, 15 patients who were suspected to have brain metastasis received body scan by (18)F-FDG PET-CT. Both images were analyzed visually and semi-quantitatively.


RESULTS
Visual analysis: for brain tumors the diagnostic sensitivity, specificity and accuracy of (18)F-FDG PET-CT was 53.3%, 72.7%, 58.5%, versus 96.7%, 90.9%, 95.1% of (11)C-MET PET-CT, respectively. All the primary foci in 9 patients with brain metastases were detected by body (18)F-FDG PET-CT scan. Semiquantitative analysis: There was a significant difference in the uptake between highly differentiated malignant and poorly differentiated tumors as well as non-neoplastic lesions for both tracers (P < 0.01), while between low-grade malignant tumors and non-neoplasm lesions, there was a difference in uptake only by (11)C-MET (P < 0.01). No significant difference between the uptakes in brain metastasis and glioblastomas was found by both tracers (P > 0.05).


CONCLUSIONS
Both (18)F-FDG and (11)C-MET PET-CT are useful in differentiation of brain ringlike-enhanced lesions on MRI imaging. (11)C-MET PET-CT is more helpful than (18)F-FDG PET-CT in differential diagnosis of low-grade neoplastic from non-neoplastic lesions. Combination of (18)F-FDG and (11)C-MET PET-CT scans can improve the accuracy of differential diagnosis for brain ringlike-enhanced lesions on MRI imaging.
Cai
Li
L
PET-CT Center, General Hospital of Tianjin Medical University, Tianjin 300052, China.
Gao
Shuo
S
Li
Da-cheng
DC
Li
Yan-sheng
YS
Chen
Qiu-song
QS
Xing
Xi-ling
XL
D000085:Acetates; D000293:Adolescent; D000328:Adult; D000368:Aged; D001922:Brain Abscess / Q000175:diagnosis; D001932:Brain Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000556:secondary; D002244:Carbon; D002250:Carbon Radioisotopes; D002648:Child; D003397:Craniopharyngioma / Q000175:diagnosis / Q000473:pathology / Q000556:secondary; D003937:Diagnosis, Differential; D005260:Female; D019788:Fluorodeoxyglucose F18; D005909:Glioblastoma / Q000175:diagnosis* / Q000473:pathology / Q000556:secondary; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010911:Pituitary Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000556:secondary; D049268:Positron-Emission Tomography / Q000379:methods*; D019275:Radiopharmaceuticals; D012680:Sensitivity and Specificity; D055815:Young Adult
D000085:Acetates; D002250:Carbon Radioisotopes; D019275:Radiopharmaceuticals; C438206:carbon-11 acetate; D019788:Fluorodeoxyglucose F18; D002244:Carbon