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Intrapulmonary Shunting Associated With Cirrhosis: Incidental Diagnosis by Perfusion Lung Scan

Intrapulmonary shunting was recognized during radionuclide lung perfusion scintigraphy performed to exclude the possible presence of pulmonary emboli in a 55-year-old cirrhotic patient. Cirrhosis of the liver needs to be considered in the differential diagnosis when a perfusion lung scan detects intrapulmonary shunting. An estimate of the degree of shunting can be obtained with equipment available in most nuclear medicine departments.