Abstract
“Hot quadrate lobe sign” refers to visualization of caudate lobe of liver due to excess accumulation of radiotracersecondary to superior vena cava obstruction. Collateral channels are formed between thoracic and mediastinalvessels; internal mammary through the paraumbilical vessels which drain blood to the left portal vein and into thecaudate lobe of liver. It was first described on Tc99-m sulfur colloid scan. We present a case with superior vena cavaobstruction presenting as hot quadrate lobe sign on F18-FDG PET-CT.Keywords: F18-FDG PET-CT, caudate lobe, superior vena obstruction, collateral vessels.
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