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Published online by Cambridge University Press: 07 October 2011
Imaging description
Some nuclear radiopharmaceuticals are notoriously sticky and will produce agglutination of red blood cells (RBCs) inadvertently drawn back into the syringe prior to tracer administration. FDG can glue a few RBCs together, which when administered intravenously, will lodge temporally in a small pulmonary artery. The clot formed at injection is usually small, short lived, and will have intense activity [1].
Importance
Incorrect interpretation of a hot lung focus could have severe adverse consequences. At a minimum, the hot clot is confusing, since there is no underlying pulmonary nodule on CT lung windows (Figure 76.1). Worse, the patient may be incorrectly interpreted to have a pulmonary metastasis, leading to incorrect staging and treatment.
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