Hepatic Dysfunction as a Paraneoplastic Manifestation of Metastatic Prostate Adenocarcinoma.

Cholestasis is a general feature of intrahepatic or extrahepatic biliary obstruction by various mechanisms including cirrhosis, stricture, choledocholithiasis, hepatitis, and neoplasms. Neoplasms can directly impinge on the hepatobiliary tree resulting in bile stasis. Stauffer's syndrome is another variant of this neoplastic process that can cause cholestasis and liver enzyme elevation without any direct hepatobiliary obstruction, and is thus categorized as a paraneoplastic syndrome of unclear pathophysiology. We report a first case of metastatic prostate adenocarcinoma with features of Stauffer's syndrome that reversed completely on androgen deprivation therapy. This is in contrast to a previously reported case of Stauffer's syndrome due to metastatic prostate adenocarcinoma, which reversed partially to androgen deprivation therapy. Our case demonstrates the importance of early recognition of Stauffer's syndrome and underlying neoplasms in patients who present with cholestasis without clear evidence of intrahepatic or extrahepatic biliary obstruction, which may lead to early initiation of treatment.