The [[5-factor modified frailty index]] was a more useful associated factor of in-[[hospital]] [[complication]]s than chronological [[age]] in patients younger than 74 years undergoing [[unruptured intracranial aneurysm surgery]]
((Kuwabara M, Ikawa F, Michihata N, Sakamoto S, Okazaki T, Hosogai M, Maeda Y, Horie N, Kurisu K, Fushimi K, Yasunaga H. The 5-Factor Modified Frailty Index as a More Useful Associated Factor Than Chronological Age After Unruptured Cerebral Aneurysm Surgery: A Nationwide Registry Study. Neurosurgery. 2022 Nov 4. doi: 10.1227/neu.0000000000002203. Epub ahead of print. PMID: 36331212.)).

[[Chronic subdural hematoma]] (CSDH) is an uncommon but potentially serious complication of clipping [[unruptured intracranial aneurysm]]s.