Non-metastatic Nephrogenic Hepatic Dysfunction (Stauffer Syndrome) and Syndrome of Inappropriate Antidiuretic Hormone Secretion (SIADH) in a Patient With Renal Cell Carcinoma Coinciding With Liposarcoma.

Stauffer syndrome is a non-metastatic, nephrogenic, hepatic dysfunction syndrome that is linked to extrahepatic paraneoplastic tumors. It manifests with varying clinical signs that include jaundice, anicteric transaminitis, elevated alkaline phosphatase, thrombocytosis, elevated erythrocyte sedimentation rate, prolonged prothrombin time, and, in some cases, hepatosplenomegaly in the absence of hepatobiliary obstruction. Stauffer syndrome is mostly associated with renal cell carcinoma, but research shows other solid malignancies are implicated with this syndrome. Stauffer syndrome is characterized by elevated liver function tests, specifically those that indicate the presence of cholestasis with or without hepatosplenomegaly. The abnormality is not due to tumor infiltration but rather indirect paraneoplastic effects that are poorly understood. Additionally, emerging literature also supports the association of syndrome of inappropriate antidiuretic hormone secretion (SIADH) secondary to malignancy in the setting of elevated interleukin-6. In this article, we present the case of a 76-year-old patient with SIADH and abnormalities in liver function tests in the context of Stauffer syndrome tied to renal cell carcinoma coinciding with liposarcoma.