Stauffer Syndrome: Another Strange Case of the Internist's Tumor.

Stauffer syndrome is a paraneoplastic disorder associated with renal cell carcinoma (RCC), which often can be the first manifestation of the tumor. It is characterized by nephrogenic hepatic dysfunction that reverses after removing the primary tumor. Stauffer syndrome has been associated with a worse prognosis in patients with RCC. We are presenting a case of a patient with an uncommon cholestatic jaundice variant. The patient also had hepatic profile alterations, but no metastasis existed. These findings meet the diagnostic criteria for Stauffer syndrome in the context of RCC as the first clinical manifestation in the diagnostic approach to malignancy-associated disease. A 74-year-old patient, with a history of obesity, hypertension, and type 2 diabetes mellitus, went for advice due to right upper abdominal pain, icterus accompanied by emetic episodes, and a cholestatic pattern in the hepatic profile. Autoimmune hepatitis was ruled out based on immunological testing. Imaging revealed evidence of a mass in the lower pole of the right kidney, suspicious of malignant neoplasia, and a distant paraneoplastic syndrome consistent with the cholestatic variant of Stauffer syndrome. This is an exciting case of Stauffer syndrome as the initial presentation of RCC associated with a cholestatic variant, providing relevant information about this uncommon condition in our setting.