ecchondroma

例句：

1. 1.This patient had a bone-forming tumor removed from his knee joint.
   这位患者从他的膝关节中移除了一个骨形成肿瘤。
2. 2.The doctor diagnosed the patient with an ossifying fibroma in his shoulder.
   医生诊断出这位患者肩膀里有骨软骨瘤。
3. 3.Ossifying fibromas are benign tumors that form within bones and can cause pain or discomfort.
   骨软骨瘤是一种良性肿瘤，可以在骨骼内形成，并可能导致疼痛或不适。