A Large Lambl's Excrescence Causing Embolic Stroke in a Young Patient: A Case Report and Review of Literature.

Lambl's excrescences (LEs) are thin, filiform and hypermobile strands that develop at the valvular coaptation sites of the heart. Since first described in 1856 by Vilém Dušan Lambl, there has been an increasing number of reports of central and peripheral emboli arising from cardiac LEs. LEs have been linked to ischemic strokes irrespective of age and comorbidities. We report one of the youngest reported cases in literature of an embolic stroke in a 25-year-old woman caused by a LE. A comprehensive workup was performed that revealed a large aortic valve LE. The patient was discharged on dual anti-platelet therapy with outpatient cardiology follow-up for surveillance echocardiograms. We then surveyed the literature and reviewed case reports and observational studies of LEs linked to systemic emboli. We found that most LEs are present on left-sided high-pressure valves especially the ventricular aspect of the aortic valves and that most reported cases of cerebral embolism had aortic valve LEs. The management of cardioembolic stroke secondary to LEs remains unclear. LEs have not been identified as a definite etiology of cardioembolic strokes warranting the need for large-scale studies to help guide the management of cardiac LEs in the setting of ischemic stroke.