What are the two divisions of the left lobe?

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The left lobe is divided into medial and lateral portions. This internal split aligns with liver segment anatomy: the medial part corresponds to segment IV (often including the quadrate area near the gallbladder), while the lateral part includes segments II and III. This division is practical for understanding surgical resections and ultrasound orientation, separating the midline-adjacent medial portion from the outer left-sided lateral portion. Other pairings like anterior/posterior or superior/inferior describe front-back or top-bottom relationships, which aren’t how the left lobe’s internal divisions are defined.