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?
A 45-year-old man with a history of chronic alcohol use presents with persistent epigastric pain and early satiety 8 weeks after an episode of acute pancreatitis. Imaging reveals a well-circumscribed, round, anechoic fluid collection adjacent to the body of the pancreas with a thin enhancing wall and no mural nodules. The structure marked **B** in the diagram is identified. Which of the following best describes the defining pathological feature that distinguishes this lesion from a true pancreatic cyst?
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