[Aneurysms as a rare cause of chronic subdural hematomas].

Chronic subdural haematomas are nowadays usually diagnosed via computed tomography. Followups are also by this method. It is therefore inevitable that aneurysms or other vascular malformations are overlooked as rare but important causes of such haematomas. If anamnesis, findings and course are atypical, it is recommended to attempt additional angiographic clarification at least in such cases.