Michael D. De Bellis, M.D., M.P.H., et al. wrote a report (5) related to hippocampal volume measurement, but their study appeared to make a mistake in its setting of amygdala and hippocampus boundaries. In Figure 2, the trace line included both the posterior amygdala and anterior hippocampus. If the authors wanted to separate the hippocampus from the amygdala, the region of interest in Figure 2 would be obviously wrong. As a result, the normal hippocampal volume in Table 1 became relatively large compared to those in earlier reports.