Introduction: Presentation of signs and symptoms of haemorrhage and/or ischaemia associated to an intracranial dissecting aneurysm is quite frequent.
Case report: A 77-year-old male with a history of a stroke probably due to a cardioembolic causation, and consequently anticoagulation therapy was established. Ten years later, a tomography scan performed because of persistent headaches revealed the presence of fusiform mirror aneurysms in both supraclinoid carotids and early stages of development in the two middle cerebral arteries with predominance of the left-hand side. The anticoagulation therapy was withdrawn. Said aneurysmal alterations did not exist in the previous study, and so they are thought to have originated due to spontaneous dissection. A month later the patient suffered a stroke in the territory of the right middle cerebral artery, caused by partial occlusion of the aneurysm by a thrombus that gave rise to turbulent flow; distal micro-embolisms were also detected in the right middle cerebral artery. Our aetiological hypothesis, in view of the way events progressed, is an arterio-arterial embolism from the aneurysmal thrombus. Supported by data from the specialised literature available on the matter, we decided to implement surgical treatment, although this possibility was rejected by the family; the decision was thus taken to establish an antiaggregating treatment regimen and follow-up.
Conclusions: Giant aneurysms are a potential source of haemorrhagic events, but we must not forget that secondary ischaemic events may also appear; more especially, the aneurysmal lumen can become partially occluded by thrombi and these then become the focus point for embolic events. A complete neuro-ultrasonographic study would be a very appropriate option with which to tailor the therapeutic decision to each patient.