A 52-year-old man presents 8 weeks after an episode of acute interstitial edematous pancreatitis with persistent epigastric pain and early satiety. Transabdominal ultrasound reveals a well-circumscribed anechoic fluid collection marked **A** in the diagram, with a thin echogenic wall and posterior acoustic enhancement. Cyst fluid analysis shows markedly elevated amylase and low CEA. According to the Revised Atlanta Classification (2012), what is the most appropriate initial management for this collection?
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