<prompt> A 69-year-old woman presents with left flank pain and hematuria. Physical examination suggests a left-sided abdominal mass. Computerized tomography CT scan of the abdomen reveals a 5-cm mass in the left kidney. Which of the following laboratory abnormalities might also be present?polycythemiathrombocytopeniahypocalcemialeukocytosis  <response>: a Source: Kasper, pp. 541-542This patient likely has hypernephroma renal cell carcinoma. Polycythemia is caused by the production of erythropoietin-like factors. There is no relationship to hypertension. The tumor frequently presents as metastatic disease. 