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Intraductal papillary mucinous neoplasms (IPMN) involve the intraductal proliferation of mucinous cells that are arranged in a papillary pattern with increasing frequency (1-3). Recently, the existence of pancreatic IPMN, although rare, is well-established. However, there are few reports of biliary IPMN (1), and to our knowledge, there are no published reports of its direct metastasis and extension. We present a case of metastasis of biliary IPMN that unexpectedly extended directly into the thoracic cavity, and we attempt to account for this extension.

Unexpected Metastasis of Intraductal Papillary Mucinous Neoplasm of the Bile Duct into Thoracic Cavity with Direct Extension: Case Report