多発脳動脈瘤における破裂瘤部位診断 : Aspect ratioの重要性について  [in Japanese] Diagnosis of the Ruptured Site in the Case of Multiple Intracranial Aneurysms : Importance of Aspect Ratio  [in Japanese]

It is sometimes difficult to make a diagnosis of the ruptured site in the case of multiple intracranial aneurysms. We retrospectively analyzed 21 ruptured cases with multiple aneurysms, focusing on the following 4 factors. 1.SAH localization: A CT scan was available for localizing the ruptured site in 13 (62%) patients. 2.Size of aneurysm: The ruptured aneurysm was larger than the unruptured aneurysm in 12(57%) patients. 3.Shape of aneurysm: The ruptured aneurysm was irregularly shaped in all patients, whereas the unruptured aneurysm in 10(34%) was irregularly shaped and in 19(66%) was round. 4.Aspect ratio of aneurysm: The aspect ratio of ruptured aneurysms was larger than that of unruptured aneurysms in 20(95%) patients. To identify the ruptured aneurysm in the patient of multiple aneurysms, it is important to consider many factors, especially the aspect ratio of the aneurysm.