It often presents as a soft painless mass, especially in pediatric populations and its appearance may sometimes be altered by position and when performing the Valsalva maneuver.

• 尤其是在儿童中，通常表现为无痛性软组织肿块，当做瓦尔萨尔瓦动作或者姿势改变时，可以发生形态的改变。