Absent pulmonary uptake on 99mTc MAA perfusion lung scan due to severe right-to-left shunt

Unexpected Hepatic Uptake of Tc-99m-MAA in Lung Perfusion Scintigraphy in a Patient with End-stage Renal Disease

“…It has been reported that extra-pulmonary accumulation of Tc-99m-MAA was less than 4% among 378 lung scan patients (2). Extra-pulmonary accumulation of Tc-99m-MAA can be detected mostly in the liver as well as the brain, kidney, thyroid, myocardium, spleen and vertebra in several studies (3,4,5,6).…”