Our literature review indicates that our patient the youngest one diagnosed with chondroblastoma in the talus.

本病例是一位十八个月大男婴，病灶位于左踝骨，较罕见，手断也较困，以分析讨论。

The os trigonum is an accessory bone of the foot, locates at the posterolateral tubercle of the talus, and occures in about 7% of population.

摘要附三角骨位于距骨之后外侧节，是脚部的附属骨之一，出现于百分之七的正常人中。