Anterior orbital mass in the right eye of a 69-year-old patient (case 1). a Livid swelling of the medial upper lid causing visual field restriction. b Computed tomography revealing a large-scale defect of the orbital roof (white arrows). c T1-weighted contrast-enhanced magnetic resonance tomography showing a round lesion with irregular hyperintensity (asterisk). d Histopathological section showing a arteriosus malformation as well as components of a capillary hemangioma (arrows, H&E staining, original magnification ×200).