The Korean Journal of Nuclear Medicine (대한핵의학회지)
- Volume 35 Issue 4
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- Pages.288-290
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- 2001
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- 1225-6714(pISSN)
Hot Spots on Tc-99m MAA Perfusion Lung Scan
Tc-99m 거대응집알부민을 이용한 폐관류 스캔에서 관찰되는 다발성 열소
- Lim, Seok-Tae (Department of Nuclear Medicine, Chonbuk National University Medical School) ;
- Sohn, Myung-Hee (Department of Nuclear Medicine, Chonbuk National University Medical School)
- Published : 2001.08.30
Abstract
A 61 year-old woman underwent perfusion and inhalation lung scan for the evaluation of pulmonary thromboembolism. Tc-99m MAA perfusion lung scan showed multiple round hot spots in both lung fields. Tc-99m DTPA aerosol inhalation lung scan and chest radiography taken at the same time showed normal findings (Fig. 1, 2). A repeated perfusion lung scan taken 24 hours later demonstrated no abnormalities (Fig. 3). Hot spots on perfusion lung scan can be caused by microsphere clumping due to faulty injection technique or by radioactive embolization from upper extremity thrombophlebitis after injection. Focal hot spots can signify zones of atelectasis, where the hot spots probably represent a failure of hypoxic vasoconstriction. Artifactual hot spots due to microsphere clumping usually appear to be round and in peripheral location, and the lesions due to a loss of hypoxic vasoconstriction usually appear to be hot uptakes having linear