Massive Primary Intraventricular Hemorrhage Due to Idiopathic Lateral Posterior Choroidal Artery Aneurysm: Case Illustration.

Peripheral aneurysms of the lateral posterior choroidal artery are rare and mostly in association with vascular and occlusive pathologies such as moyamoya disease. To the best of our knowledge, pure lateral posterior choroidal artery aneurysms without association of any other vascular diseases are unique and only 3 cases have been reported in the literature.