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山顶积雪征是指肱骨头或股骨头骨缺血坏死后形成X线片上的致密骨质硬化改变，如同白雪覆盖的山顶。
Snowcap sign or snowcapping is defined as the appearance of dense sclerosis over the head of humerus or femur in cases of avascular necrosis as seen on plain radiographs, which resembels a snow capped mountain.（http://radiopaedia.org/articles/snowcap-sign）图片来源：neurocritic.wordpress.com科普大赛获奖动画展示，一站式搞定科普动画长图制作！
