The treatment outcomes of unruptured cerebral aneurysms (UA) have improved due to a combination of open surgery and endovascular surgery. However, it remains unclear which patients should be screened for UAs. Thus, we clarified the risk factors associated with the detection of UAs to be treated. Five hundred and sixty-six patients examined by brain dock and 35 patients treated for UAs were included in this study. Results: The UAs detected by brain dock were 14 (2.4%). Hypertension, hyperlipidemia, history of cerebrovascular disease, and headache were risk factors for UAs that reuire treatment. In conclusion, for detecting UAs that should be treated, brain screening for patients with hypertension, hyperlipidemia, history of cerebrovascular disease, and headache is important.