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Figure 2: 99Technetium macroaggregated albumin perfusion imaging in a patient with HPS shows a right to left shunt. The 99mTc-MMA has entered the systemic circulation and distributed to systemic organs. Normally, <5% of the isotope can be quantitated over the brain. In HPS, there is >6% uptake in the brain as in this case. (Courtesy Durre-e-Sabih Multan)

Figure 2: 99Technetium macroaggregated albumin perfusion imaging in a patient with HPS shows a right to left shunt. The 99mTc-MMA has entered the systemic circulation and distributed to systemic organs. Normally, <5% of the isotope can be quantitated over the brain. In HPS, there is >6% uptake in the brain as in this case. (Courtesy Durre-e-Sabih Multan)