Assessment of risk factors in aneurysm development.

Aneurysms that occur anywhere in intracranial except where primary aneurysms develop, are called "de novo aneurysms". The risk factors and formation time of de novo aneurysms are not fully known. Congenital, environmental and hemodynamic factors can play a role in aneurysm development. The 43-year-old female patient was operated with the middle cerebral artery superior trunk aneurysm in our clinic. She came to us again after 17 months with a severe headache. In computed cranial tomography angiography, the middle cerebral artery superior trunk placement aneurysm was found to have a partial clip and "de novo aneurysm" was developed. She was re-operated for "de novo aneurysm". In this study, the risk factors in development of "de novo aneurysms" were discussed in the light of literature through this patient.