tetano
Editor, Senior Moderator
Clin Nucl Med. 2011 Oct;36(10):848-53.
Incidence and Intensity of F-18 FDG Uptake After Vaccination With H1N1 Vaccine.
Burger IA, Husmann L, Hany TF, Schmid DT, Schaefer NG.
Source
From the *Division of Nuclear Medicine, Department Medical Radiology, University Hospital of Zurich, Zurich, Switzerland; and ?Division of Medical Oncology, Department of Internal Medicine, University Hospital of Zurich, Zurich, Switzerland.
Abstract
OBJECTIVE:
: To analyze the effect of H1N1 influenza A virus vaccination in patients referred for staging or follow-up F-18 fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) for different malignant tumors.
METHOD AND MATERIALS:
: Medical history of all patients scheduled for FDG PET/CT during the national vaccination campaign against H1N1 was evaluated for recent vaccination. Site of injection and time between PET/CT and the date of vaccination (dTime) was determined. A difference in the maximum SUV between ipsi- and contralateral deltoid muscle or axillary lymph node of more than 0.5 was determined as positive reaction. The best cut-off dTime for still visible reaction was calculated. All patients with positive ipsilateral lymph node were clinically followed. Institutional Review Board approval was waived.
RESULTS:
: Of 269 patients, 58 (21.5%) were vaccinated for the H1N1 within 4 weeks prior to PET/CT (mean, 14.5 ? 8.7 days). Of them, 17 (29.3%) patients had FDG-positive lymph nodes (mean SUV, 1.43 ? 1.06), with a dTime range from 1 to 14 days. Only 2 of them had no increased FDG uptake in the ipsilateral deltoid muscle. The area under the receiver operator characteristic curve revealed a strong relation between time delay (dTime) and axillary activity (AUC, 0.9; 95% confidence interval, 0.816-0.983) with a cutoff at 8 days (Youden Index). At follow-up (mean, 183 days; range, 173-196 days), no patient was found to have required treatment or signs of axillary lymphadenopathy.
CONCLUSIONS:
: H1N1 vaccination can cause false-positive FDG PET/CT findings, when administered less than 14 days before the test, with the highest probability if the vaccination was administered less than 8 days ago. Increased FDG activity in the ipsilateral deltoid muscle is a key finding for accurate interpretation of increased FDG activity in axillary lymph nodes.
PMID:
21892032
[PubMed - in process]
http://www.ncbi.nlm.nih.gov/pubmed/21892032
Incidence and Intensity of F-18 FDG Uptake After Vaccination With H1N1 Vaccine.
Burger IA, Husmann L, Hany TF, Schmid DT, Schaefer NG.
Source
From the *Division of Nuclear Medicine, Department Medical Radiology, University Hospital of Zurich, Zurich, Switzerland; and ?Division of Medical Oncology, Department of Internal Medicine, University Hospital of Zurich, Zurich, Switzerland.
Abstract
OBJECTIVE:
: To analyze the effect of H1N1 influenza A virus vaccination in patients referred for staging or follow-up F-18 fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) for different malignant tumors.
METHOD AND MATERIALS:
: Medical history of all patients scheduled for FDG PET/CT during the national vaccination campaign against H1N1 was evaluated for recent vaccination. Site of injection and time between PET/CT and the date of vaccination (dTime) was determined. A difference in the maximum SUV between ipsi- and contralateral deltoid muscle or axillary lymph node of more than 0.5 was determined as positive reaction. The best cut-off dTime for still visible reaction was calculated. All patients with positive ipsilateral lymph node were clinically followed. Institutional Review Board approval was waived.
RESULTS:
: Of 269 patients, 58 (21.5%) were vaccinated for the H1N1 within 4 weeks prior to PET/CT (mean, 14.5 ? 8.7 days). Of them, 17 (29.3%) patients had FDG-positive lymph nodes (mean SUV, 1.43 ? 1.06), with a dTime range from 1 to 14 days. Only 2 of them had no increased FDG uptake in the ipsilateral deltoid muscle. The area under the receiver operator characteristic curve revealed a strong relation between time delay (dTime) and axillary activity (AUC, 0.9; 95% confidence interval, 0.816-0.983) with a cutoff at 8 days (Youden Index). At follow-up (mean, 183 days; range, 173-196 days), no patient was found to have required treatment or signs of axillary lymphadenopathy.
CONCLUSIONS:
: H1N1 vaccination can cause false-positive FDG PET/CT findings, when administered less than 14 days before the test, with the highest probability if the vaccination was administered less than 8 days ago. Increased FDG activity in the ipsilateral deltoid muscle is a key finding for accurate interpretation of increased FDG activity in axillary lymph nodes.
PMID:
21892032
[PubMed - in process]
http://www.ncbi.nlm.nih.gov/pubmed/21892032