RT Journal Article SR Electronic T1 Rapid Enlargement of a Posterior Communicating Artery Aneurysm after Guglielmi Detachable Coil Treatment of Ipsilateral Carotid Artery Aneurysms JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1577 OP 1579 VO 23 IS 9 A1 D. T. Jeck A1 J. R. Leonard A1 D. T. Cross III A1 C. J. Moran A1 R. G. Dacey, Jr A1 C. P. Derdeyn YR 2002 UL http://www.ajnr.org/content/23/9/1577.abstract AB Summary: This case illustrates rapid aneurysm enlargement, presumably due to altered hemodynamics resulting from endovascular treatment of aneurysms on the same artery. We postulate that increased hemodynamic force directed to the inflow zone of the posterior communicating artery aneurysm was caused by the treatment of the two ophthalmic artery aneurysms. Originally, many of the flow vectors may have been directed into the larger ophthalmic segment aneurysm, located on the outside of the curve of the internal carotid artery. After treatment, flow may have been directed more smoothly around the carotid siphon and into the posterior communicating artery aneurysm.