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

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.

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