A 48-year-old woman with autosomal dominant polycystic kidney disease (ADPKD), hypertension, and a family history of subarachnoid hemorrhage (mother died at age 52) presents for screening MR angiography of the circle of Willis. Imaging reveals a 7 mm saccular berry aneurysm with a daughter sac at the dome, indicating rupture risk. The structure marked **A** in the diagram represents the aneurysm location. At which arterial junction is this aneurysm most commonly found in patients with ADPKD and family history of intracranial hemorrhage?
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