What conditions result in a hot quadrate lobe and a hot caudate lobe on a liver or spleen scintigraphy

What conditions result in a hot quadrate lobe and a hot caudate lobe on a liver or spleen scintigraphy?

Superior vena cava obstruction results in increased radiotracer activity in the quadrate lobe (i.e., the medial segment) of the liver following intravenous radiotracer administration via an upper extremity vein. This occurs because collateral thoracic and abdominal vessels communicate with a recanalized para-umbilical vein, resulting in a hot quadrate lobe relative to the other areas of the liver. Budd-Chiari syndrome (hepatic vein thrombosis) may lead to increased radiotracer uptake in the caudate lobe of the liver, because it has preserved function owing to direct venous drainage into the inferior vena cava whereas the remainder of the liver has decreased radiotracer activity because of impaired function.

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