This bony stalk is called an exostosis, and it has a cap, made mostly of hyaline cartilage.

这种柄被称为外生，有软帽，为透软构成。

For example, osteochondroma cause exostoses, while the giant cell tumor forms a multicystic bone lesions that look like soap bubbles.

例如，软瘤形成外生；巨细胞瘤形成囊样病变，状似皂泡样。