Multiple choice

According to Couinaud's classification, which is the 4th segment of the liver?

  1. Caudate lobe

  2. Quadrate lobe

  3. Left lobe

  4. Right lobe

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B Correct answer
Explanation

Couinaud's classification divides the liver into 8 functionally independent segments. The quadrate lobe corresponds to segment IV (specifically segment IVa superiorly and IVb inferiorly), which is part of the left anatomical lobe but has separate portal venous supply and biliary drainage.