PMC3095808_01
Volume rendered images of CT angiography of the neck in right anterior oblique (RAO), left anterior oblique (LAO), and anterior projections demonstrate bilateral ossification of the stylohyoid ligaments. The left ligament shows an articulated form of ossification (green arrows). The right ligament is ossified at its proximal and distal sides with pencil-sharp free ends (yellow arrows). A large, 4-cm bilobed pseudoaneurysm (red arrows) has formed, arising from the origin of external carotid artery on the right. The patient felt a growing mass over the past 4 months. No history of major trauma was reported. The diagnosis was confirmed by conventional angiography. ECA=external carotid artery
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Fig1
CT angiography with three-dimensional (3D) volume rendering showed a bilobed 4.0-cm right ECA pseudoaneurysm (Fig. 1) with edema extending to the skull base.