A, Anteroposterior view of left shoulder of 37-year-old woman with hemangioendothelioma reveals destructive lesion in left glenoid. B, CT better shows extent of lesion. C, Photograph of resected specimen. D, Typical microscopic appearance of hemangioendothelioma. Malignant endothelial cells produce anastomosing vascular channels. These cells stained positive for factor VIII–related antigen.