Abstract
Four patients with superior vena caval obstruction were found to have focal areas of increased uptake in the region of the left lobe of the liver following I.V. antecubital injection of 99mTc-sulfur colloid. Abnormal liver uptake of 99mTc-macroaggregated albumin was also noted in two of two patients studied. Most of the patients with superior caval obstruction had no hot spots in their liver scans. Dynamic studies showed collateral venous channels from the anterior chest wall leading to the area of the “hot” spots in the liver. The magnitude and pattern of hot spots appear to reflect clinical status in only one of these patients with a long followup period. Perhaps these simple procedures should be conducted more often in order to elucidate the exact mechanism of the hot spots in the liver scan and their possible use in the followup of patients with superior vena caval obstruction.
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