MUSEUM OF HMH MULTIMODALITY IMAGING CENTER
Alshammari BS, Reardon MJ, Nabi F. Late Left Ventricular Pseudoaneurysm after Acute Myocardial Infarction. Methodist DeBakey Cardiovasc J. 2017;13(3):169-171doi: 10.14797/mdcj-13-3-169
cardiac magnetic resonance imaging , pseudoaneurysm , long inversion time imaging
A 71-year-old female with diabetes and recent quadruple coronary artery bypass grafting for acute coronary syndrome 8 months prior presented with worsening shortness of breath on minimal exertion, orthopnea, and fatigue. She was found to have a large left ventricular (LV) mass on a computer tomography chest scan and transferred to our hospital for further management.
The patient underwent cardiac magnetic resonance imaging (CMR) for further evaluation. CMR images demonstrated a free wall rupture of the basal inferolateral wall that resulted in a large LV pseudoaneurysm (Figures A, B). Long inversion time (TI) imaging after administration of gadolinium showed a large thrombus burden within the LV pseudoaneurysm (Figures C, D). There also was a marked delayed hyperenhancement of the adherent pericardium (Figure E).
LV pseudoaneurysms form when a free wall rupture is contained by adherent pericardium (most frequently in the posterior wall, followed by the lateral and apical walls).1,2 A pseudoaneurysm is traditionally characterized by a small neck communication between the left ventricle and aneurysmal cavity in which the ratio of the diameter of entry and the maximal diameter of the pseudoaneurysm is < 0.5.3 One of the distinguishing features of LV pseudoaneurysm compared with true aneurysm on CMR is marked delayed enhancement of the surrounding pericardium.4 Left ventricular pseudoaneurysms have a 30% to 45% risk of rupture and a mortality rate of almost 50% when treated medically.5,6 Thus, surgery is the preferred therapeutic option.
The patient promptly underwent cardiac surgery, which confirmed an inferolateral LV pseudoaneurysm (Figure F) with a small neck of LV pseudoaneurysm and a large lining thrombus (asterisk) shown in Figure G. She underwent uneventful LV pseudoaneurysm excision with patch repair (Figure H, I).
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- Konen E, Merchant N, Gutierrez C, et al. True versus false left ventricular aneurysm: differentiation with MR imaging–initial experience. Radiology. 2005 Jul;236(1):65-70.
- Vlodaver Z, Coe JI, Edwards JE. True and false left ventricular aneurysms. Propensity for the altter to rupture. Circulation. 1975 Mar;51(3):567-72.
- Bolooki H. Surgical treatment of complications of acute myocardial infarction. JAMA. 1990 Mar 2;263(9):1237-40.