<prompt> A 69-year-old woman presents to the emergency department with symptoms of left flank pain and hematuria. On physical examination, the blood pressure is 16596 mmHg, heart rate is 104min, and the abdomen is soft and nontender. There is some left costo-vertebral angle tenderness on percussion. A computerized tomography CT scan of the abdomen reveals a 5-cm mass in the left kidney. See Figure below Which of the following laboratory abnormalities might also be present?polycythemiathrombocytopeniahypocalcemialeukocytosis  <response>: This patient likely has renal cell carcinoma RCC. Polycythemia is caused by the production of erythropoietin-like factors. There is no relationship to hypertension. The tumor frequently presents as metastatic disease. Thrombocytopenia is not a feature of RCC, and hypercalcemia may occur if there is bone metastasis. High renin production does not occur in RCC either. 