A 68-year-old man presents with painless jaundice and pale stools for 3 weeks. Axial CT abdomen shows a hypodense lesion in the structure marked **A** (pancreatic head). Laboratory tests show elevated conjugated bilirubin and markedly elevated alkaline phosphatase. Which anatomical relationship of the structure marked **A** best explains the patient's presentation and is the critical determinant for surgical planning?
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