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- W2030710367 abstract "To the Editor I read the article titled “Macroaggregated albumin (MAA) injected in hepatic artery visualized in a recanalized paraumbilical vein” by Gupta et al1 with great interest. Localization mechanism of 99mTc-MAA is related to the particle size of MAA (usually 30–50 μm), which is larger than the size of the capillary. When the particles infused into the hepatic artery, they distribute according to blood flow and are trapped on first pass in the arteriolar-capillary bed of the liver. Therefore, the 99mTc-MAA hepatic arterial scintigraphy can help to determine the possibility and amount of extrahepatic perfusion by intrahepatic infusion of 90Y microspheres, which gives rise to systemic toxicity. The report by Hsieh et al,2 introduced on the interesting image, had demonstrated visualization of the portosystemic collateral circulation with 99mTc RBC scintigraphy and it is natural because of the localization mechanism of 99mTc RBC in blood vessels. The case report by Chernyak et al3 visualized focal tracer uptake at the abdominal wall with 99mTc-MAA scintigraphy. It might be possible by 99mTc-MAA accumulation in a small area of the abdominal wall by its possible blood supply from the patent hepatic falciform artery. Owing to the localization mechanism of the 99mTc-MAA particle, the particles which arrived at paraumbilical vein should flow away to next arteriolar-capillary beds. Therefore, an uptake mechanism of the 99mTc-MAA at the recanalized large paraumbilical vein on the SPECT imaging of the interesting image is not obvious and hard to be conjectured. Readers of the interesting image might be more curious about the reason of MAA retention in the paraumbilical vein, and hopefully, it will be answered or suggested by the authors. Byeong-Cheol Ahn, MD, PhD Department of Nuclear Medicine Kyungpook National University School of Medicine and Hospital Daegu, South Korea [email protected]" @default.
- W2030710367 created "2016-06-24" @default.
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- W2030710367 date "2012-09-01" @default.
- W2030710367 modified "2023-09-23" @default.
- W2030710367 title "Macroaggregated Albumin (MAA) Injected in Hepatic Artery Visualized in a Recanalized Paraumbilical Vein" @default.
- W2030710367 doi "https://doi.org/10.1097/rlu.0b013e31825b2457" @default.
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