The serum S100β levels of the single patient who had postoperative CT scan evidence of infarction were significantly higher in the immediate postoperative (p = 0.019, 95% CI -0.342 to -0.034) and 24-hour (p = 0.009, 95% CI -0.3 to -0.048) postoperative measurements when compared with patients who had no CT scan evidence of bleeding or infarction. The gene discussed is S100B; the disease is infarction.