Incidental focal F-18 FDG accumulation in lung parenchyma without abnormal CT findings.
F-18 fluorodeoxyglucose (FDG) PET/CT that simultaneously offers anatomic and metabolic information is widely used and has become an effective modality in many clinical fields, especially oncology. For accurate interpretation, it is necessary to understand false-positive findings in the F-18 FDG PET image, such as physiologic conditions, findings related to patients' medical and surgical histories, normal variants, and artificial conditions. We report three cases of incidental focal F-18 FDG accumulation in lung parenchyma without abnormal CT findings in the PET/CT images. In the primary PET/CT studies, two cases showed single and one case showed multiple FDG foci in the lung without any CT abnormalities. All FDG accumulations disappeared in PET/CT studies repeated 1-3 days after the primary scannings. These artifacts are probably related to microembolisms attributable to the intravenous injection of F-18 FDG. Therefore, a cautious interpretation of the correspondence between anatomic and metabolic images is required and repeated PET/CT is helpful.
Ha
Jung-Min
JM
Department of Nuclear Medicine, Chonnam National University Medical School, 8 Hakdong, Gwangju 501-757, South Korea.
Jeong
Shin-Young
SY
Seo
Young-Soon
YS
Kwon
Seong-Young
SY
Chong
Ari
A
Oh
Jong-Ryool
JR
Song
Ho-Chun
HC
Bom
Hee-Seung
HS
Min
Jung-Joon
JJ
D000368:Aged; D016477:Artifacts; D019788:Fluorodeoxyglucose F18 / Q000008:administration & dosage / Q000378:metabolism*; D006801:Humans; D007275:Injections, Intravenous; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000378:metabolism* / Q000473:pathology; D008297:Male; D049268:Positron-Emission Tomography; D011655:Pulmonary Embolism / Q000209:etiology; D014057:Tomography, X-Ray Computed
D019788:Fluorodeoxyglucose F18