Objective and importance: To describe the clinical presentation and endovascular management of peripheral aneurysms of the lateral posterior choroidal artery. Aneurysms in this location are exceptionally rare and optimal treatment may be difficult.
Clinical presentation: Two patients with peripheral aneurysms of the distal portion of the lateral posterior choroidal artery presented with headaches from extensive intraventricular hemorrhage.
Intervention: Endovascular surgical therapy by use of superselective n-butylcyanoacrylate embolization of the aneurysm and adjacent distal parent artery was successful in both patients.
Conclusion: Patients with peripheral aneurysms of the lateral posterior choroidal artery usually present with intraventricular hemorrhage. They may be difficult to treat by open surgical techniques owing to their intraventricular location and the frequent inability to preserve the parent artery by aneurysm clipping. Instead, it is typical that either proximal parent artery occlusion or aneurysm trapping must be used. An equivalent endovascular surgical technique may be an attractive alternative method of management.