This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Not true about mucinous cystadenoma pancreas- \nSelect and explain. \nA. Microcystic adenoma, B. Lined by columnar epithelium, C. Pre malignant, D. Focus of ovarian stroma in it', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mucinous cystadenoma is macrocystic, not the microcystic adenoma.\nMCN: MC cystic neoplasm\xa0of the pancreas.\nFrequently seen in young women, mean age 5th decade.\nMore common in the body and tail of the pancreas.\n\nPathology\n\nMCNs contain mucin-producing epithelium, macrocystic.\nHistology: Presence of mucin-rich cells and ovarian-like stroma.\nEstrogen and progesterone staining are positive in most cases.\n\nClinical Features\n\nIncidental MCN is becoming increasingly common.\nUp to 50% of patients present with vague abdominal pain.\nA history of pancreatitis may be found in up to 20% of patients, which explains the common misdiagnosis of pseudocyst.\n\nDiagnosis\n\nCT scan: Presence of a solitary cyst with fine septations and rim of calcification.\nCross-sectional imaging may not be able to distinguish between benign and malignant MCNs.\nPresence of eggshell calcification, larger tumor size, or a mural nodule on cross-sectional imaging is suggestive of malignancy.\nCyst fluid analyses: Mucin-rich aspirate, high CEA and low amylase levels.\nThese fluid analyses provide accurate diagnosis in up to 80% of cases.\n\nTreatment\n\nExclusion of malignancy can’t be obtained by biopsy alone, so surgical excision is indicated for all mucinous cystic neoplams, because extensive histological sampling is required for confirmation.\nPancreatic resection is the standard treatment for MCNs.\nIn the absence of invasive malignancy, resection is curative and no further surveillance is required.', 'role': 'assistant'}]