====== Hair-On-End ====== “[[Hair-On-End]]” appearance in the [[skull]] 1. common a) congenital hemolytic anemia(e.g.thalassemia,sickle cell,hereditary spherocytosis,pyruvate kinase deficiency) 2. uncommon a) hemangioma b) cyanotic congenital heart disease (with secondary polycythemia) c) [[iron]] deficiency anemia d) metastases: especially neuroblastoma, thyroid carcinoma e) multiple myeloma f) meningioma g) osteosarcoma h) polycythemia vera