A 47-year-old woman presents with vague upper abdominal discomfort. CT imaging reveals a 7-cm cystic lesion in the pancreatic body-tail. The structure marked **A** in the diagram—a unilocular thick-walled cyst with peripheral eggshell calcification and no communication with the main pancreatic duct—is identified on EUS-guided cyst aspiration to contain elevated CEA (>800 ng/mL), low amylase, and viscous mucinous material. Histology demonstrates columnar mucinous epithelium with an underlying densely cellular ovarian-type stroma. Based on these imaging and pathological findings, what is the most appropriate management?
A. Whipple pancreaticoduodenectomy
B. Endoscopic ultrasound-guided drainage and surveillance
C. Distal pancreatectomy with splenectomy
D. Observation with serial imaging every 6 months
Explanation
Why Distal pancreatectomy with splenectomy is right
The unilocular thick-walled cyst marked A, combined with the absence of duct communication, elevated CEA, viscous mucin, and pathognomonic ovarian-type stromal cells, defines a mucinous cystic neoplasm (MCN) of the pancreas. According to the Fukuoka/Kyoto IPMN guidelines and Cameron Current Surgical Therapy, ALL confirmed MCNs are resected at diagnosis because of the substantial risk of progression to invasive mucinous cystadenocarcinoma. For lesions in the body-tail (as in this case), distal pancreatectomy ± splenectomy is the standard surgical approach. Non-invasive MCN has excellent prognosis (>95% 5-year survival) after resection.
Why each distractor is wrong
Endoscopic ultrasound-guided drainage and surveillance: EUS-guided aspiration is a diagnostic tool (as performed here), not a therapeutic intervention. MCNs do not communicate with the duct system, making endoscopic drainage technically infeasible and clinically inappropriate. Surveillance without resection is contraindicated given the premalignant nature of MCN.
Observation with serial imaging every 6 months: Surveillance is appropriate for serous cystadenomas (benign, elderly women, central scar) or low-risk branch-duct IPMNs, but NOT for confirmed MCNs. The ovarian-type stroma and lack of duct communication distinguish this from IPMN, and the premalignant biology mandates resection at diagnosis.
Whipple pancreaticoduodenectomy: This extensive resection is reserved for lesions in the pancreatic head/uncinate region or when there is involvement of the hepatic hilum or duodenum. The body-tail location and absence of proximal involvement make distal pancreatectomy the appropriate extent of resection.
High-YieldNEET PG
MCN = unilocular, no duct communication, ovarian stroma, middle-aged women, body-tail → resect all; IPMN = duct communication, older patients, head/uncinate, no ovarian stroma → resect only high-risk stigmata.
Fukuoka/Kyoto IPMN Guidelines; Cameron Current Surgical Therapy
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