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The differential diagnosis of a lateral neck mass includes a number of possible etiologies. While jugular venous aneurysms and pseudoaneurysms are rare entities, they should be considered in the differential diagnosis of a pulsatile lateral neck mass.This article presents a case of an idiopathic jugular venous pseudoaneurysm and its association with worsening tricuspid regurgitation in a patient with heart failure with preserved ejection fraction.This patient's vascular defect appeared to be a pseudoaneurysm rather than a true aneurysm because the integrity of the underlying vessel was intact with the exception of a narrow communication between the vessel lumen and surrounding soft tissue containing the lesion. In comparison, a true aneurysm involves dilatation of all three layers of the vessel wall without communication with surrounding soft tissue...
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